There are so many good things to say about PPL Center, that it's hard to find fault.

However, finding fault is a journalist's duty. Here we go. First, the kudos.

The vibe: The glass-facade entrance at Seventh and Hamilton streets is impressive. There is a sense of grandeur, but also a welcoming feeling.

The arena has the sense of a stadium bowl with a roof. Though it seats 8,500 for hockey games and 10,000 for concerts, the stage and arena floor seems close. I'm not a hockey fan, but the PPL Center makes me want to see The Phantoms play there.

As a fellow journalist said, "Sitting here, I just can't imagine that when I step outside I'm in downtown Allentown. It feels more like I'm in Philly or New York."

Seating: Sight lines appear to be good from nearly every seat. The upholstered theater-style seats are more comfortable than at many venues.

The staff: The PPL Center staff was invariably pleasant and helpful opening night at the Sept. 12 Eagles' concert, from those at the ticket booth, to greeters at entrance doors, to ushers. The usher admonishing me and another reporter to put away our cell phone cameras did so in a most courteous manner.

The ushers are stylin.' Their snazzy uniforms of khaki pants, blue logo-ed sweater vest, dress shirts and orange ties made me wish I had applied for a part-time arena job.

Now for the quibbles.

Concession kiosks: With the opening of additional food venues inside the arena, confusion at the kiosks should take care of itself. At the Eagles' concert, concession lines seemed long, snaked around and impeded pedestrian flow around the arena perimeter on the entrance level. Better positioning of food and beverage kiosks, and-or more of them, should help.

Rest rooms: There was such a long line at one of the men's rooms on the 100 level during the Eagles' concert intermission, that I opted out and returned to my seat when I heard the beginning chords of the group's second set opening song.

After the more than three-hour concert, I noticed that the entrance and exit is the same for the men's room that I used. This created congestion when the lines were long and awkwardness when there weren't lines.

The men's room I've used at Coca-Cola Park has separate entrances and exists. This design flaw probably can't be rectified at PPL Center. Plan, and drink, accordingly.

Steps: The arena steps for the 100-seating level seem to be of less than normal height. This may have been required for reconfiguring arena seating or out of consideration for youngsters who attend events. I found it easier to take two steps at a time.

Cup holders: The depth of the seats' cup holders appears to be too shallow, especially for large-size beer containers or cans and plastic beverage cups.

Trash receptacles: On opening night. Sept. 12, I noticed only one trash can just inside the Seventh and Hamilton streets entrance. I know that because I used it as a temporary desk to upload photos to social media. Additional inside trash cans will probably be added. Will there be recycling containers to separate glass and metal from cardboard and paper trash?

Traffic and parking: I have a secret downtown parking spot and walked a few blocks to PPL Center. However, the parking deck entrance appears to have been located too close to Seventh and Linden streets. This probably couldn't be avoided given the arena's tight footprint. I encountered no traffic congestion driving from the east and south to the downtown. Before the Eagles' Sept. 12 concert, North Seventh Street appeared to be bumper-to-bumper as far as the eye could see.

Load-out: Seven semi-trailer trucks that hauled equipment for the Eagles' concert were parked along the west side of Seventh Street between Linden and Hamilton. If trucks park there for upcoming concerts when the Renaissance hotel is open, there may be diesel engine noise and exhaust odor, as well as aesthetic, problems, for hotel guests and those living in the upscale apartment complex being built on the southeast corner of Seventh and Linden streets.

Perhaps concert equipment trucks could be parked at a satellite lot, say, the LANTA Allentown Transportation Center between Sixth and Seventh streets.

Mysterious drains: A photo posted by Joe McDermott on facebook caused considerable comment. On Friday night, Sept. 12, after the Eagles' concert, I observed water flowing from jowl-like pipes near the base of PPL Center onto the Hamilton Street sidewalk. The water flow increased during Sept. 13 rains.

One facebook post speculated the water might be overflow from the PPL Center Heating, Ventilation and Air Conditioning system. Another speculated on the insurance risk should the water become ice on the sidewalk during freezing temperatures.

This problem needs to be addressed. I wonder if it violates the Clean Water Act under the U.S. Environmental Protection Agency the National Pollutant Discharge Elimination System (NPDES) permit program.