I do not own showcase cages, but I remember reading in the past that they had one issue: the doors did not fit in the track properly on some cages the shipped out, specifically the 4 ft option. Basically the track was uneven and the track would get stuck or slide out sometimes.
That said, the above posters seem happy with them so they may have fixed the issue or gotten lucky. They have some great features such as the seamless design (no need to seal the cage), cut-outs for lighting and heating, and they are made of HDPE. In my opinion, this is arguably the best plastic for snake caging.
The only cons are the potential door issue, I would have liked to see a deeper lip for substrate, but that is more a personal preference. Some have complained that their customer service isn't very good, but that too may have changed. You might do a google search and look around. There are not a ton of reviews, likely to due price and comparable cages being much cheaper (i.e. Animal PLastics, Constrictors NW), but there are some.