I will make a few comments on the AP racks. I have two AP racks that hold either 14 15qt tubs or 7 32 qt tubs. They are the standard version. They hold the temps great and humidity as well. I have both hooked up to a Herpstat Pro thermostat and could not be happier.
As for the economy racks like someone stated above, if you have a warm room thay will work great. A friend had one and the temps never stayed where he wanted them. He keeps his house kinda cool. But in his standard AP racks no problems.
They no longer offer the heat cable because it was going out prematurely. Just had a friends cable go out after about a year. THey do have good customer service. Very timely response on Emails. As far as replacing things when I recieved my first rack one of the sides was cracked. I emailed pictures and they were great about it. I needed the rack that day so I made provisions to make the sides work but they took care of me with a credit.
Turn around time is kind of slow but I dont know how quick other companies are either. It takes about 4-5 weeks to get your order. SO if you need it quick, thats prolly not gonna happen because they make to order.
Sorry for the winded post but I hope this helps in your decision a bit