I use UTH on my T8 enclosures. I think the sizes are large and XL, I don't remember the wattage, definitely too big for a 30 gallon tank.
I have both enclosures with and without locks. I picked up some locks at my local Home depot but it wouldn't fit! I think it's the middle piece of the tank blocking the way. I'm not handy with that things but I tried and tried and wouldn't work. If someone else can link a lock that does work on a T8, I would appreciate it 🙂. For the ones without a lock, I stick some paper in between the glass to make sure the glass won't move.
I tried the quick ship option. Nothing is quick about AP because of their high workload. Last time I think I waited close to 3-4 months for a quick ship T8. Now they listed the wait time to be around 21 weeks, but some people complained that they waited close a year and still no enclosure. AP makes good affordable enclosures, so if you want one, expect to wait longer than 21 weeks.
I have been looking to upgrade my Children python's tank to a more arboreal cage that is at least 3 or 4 foot tall. It seems like an overkill for a small snake but I think these active snakes need more space than we think. I am waiting for my Complete Children Python book in the mail so I can confirm what their needs are in the wild, and try to replicate that to my snake. Anyways, I have been eyeing AP 4 foot arboreal enclosure but due to their high wait time, and so many new competitors popping up, I'm going to look around some more.