I've incorporated proviron into my last 2 cycles and my current cycle...it has proven to exhibit excellent AI properties when ran during cycle, eliminating the need for me to have to run more conventional AIs such as a-dex or aromasin...
Proviron is also known to bind well to SHBG, hence freeing up more test into circulation. It's also know to work synergistically with all other AAS's in the stack you may be running...
This all has given me more than enough incentive to run proviron in the mix with most any cycle I may run...I've also found proviron to aide in a much more stable recovery during PCT...it seems to eliminate the crash effect I've experienced with PCTs in the past and makes for a smoother transition from being on to going off as Proviron is known to actually have a positive impact on your HPTA.
My experience with proviron backs up the very claims that AR has pointed out in the profile on proviron and its use in the BB community:
http://www.steroid.com/Proviron.php
-ShrpSkn