Phoenix Rebuilt Transmissions?

[67ChevyRedneck]

It's possible my 00 Z may need a new tranny soon, so I was trying to source a rebuilt one for it and I came across Phoenix Transmissions in Phoenix, AZ. Classic trucks did a write up on them (for a 200R4 to be put into project old school?) a few or several months ago (time flys) and while I was at it I checked out their 700R4's. They list a rebuilt one at $550 with a core of $250 and $260 for shipping. The trannys comes with a torque converter and the shipping price includes shipping your core back (so the net charge before tax would be $810 bucks.) The trannys are DYNO tested for 40 minutes before being shipped, cool, huh? I was going to go with a BO tranny ($895 + $125 for torque converter + whatever for shipping and no core charge). I will still be using BO TV and lock-up kits. The tranny comes with a 12 month warranty with the option to buy a 24, 36 and 48 mo. warranty. Sounds like a good deal, anyone have any experience with them?