I had a 5 stack of Boaphile 4x2s, got them in 2002 and sold them in 2014 - they held up great. Details and photos can still be seen at my ad on fauna: http://www.faunaclassifieds.com/foru...d.php?t=479181
Photobucket so may not show:
I never had any staining or odor issues with them, they housed boas. If he changed the material used since then, then I don't know but with those I never had any issues. Never had any big issues with sagging either thank goodness. The hardware did rust (bolts/nuts and screws are easy to replace though). I like the drop down doors but I did have an issue with an escape. I used large heavy ceramic water bowls in these, usually in the middle of the cage, and my largest boa (who was a known escape artist) figured out she could leverage her body against the heavy dish to push out the middle of the door and squeezed out. (coming home to see my 7' boa's locked cage empty was quite a shock haha). I moved her into a ProLine after that, none of my other boas figured it out luckily. So my advise for a single drop down door is to add an extra latch in the middle to keep them secure.
I have some AP tub racks and have been really impressed with the quality of those. BF's dad uses AP caging for all his snakes and I like them so far.
I originally sold the Boaphiles because all the herpcages my ATBs are in are white and I liked Proline (NW Constrictors) caging that I already had and wanted everything to match white. The old Proline caging is great but does sag if anything heavy is put on top (learned this the hard way) even with the center divide. I got some of his new style cage stacks but he changed the material used which is now quite porous and I have had issues with staining which I am not happy about.
So I got a Freedom Breeder rack to replace the Boaphiles which I've been using for the last 4 years and it just isn't working for me. My set up/room doesn't allow me to full pull out the drawers and I hate the rounded corners with the bedding I use. I will be selling that (hopefully) before I move and getting some AP caging instead. Looks like I'll be back to having both white and black caging again. Oh well.
Good luck with whatever you decide!