I've used all 3. Bushmaster..Gravity...Purple Maxx.
The BM will stop vertical growth and make very dense buds but it also lessens the trich production (can't keep up with the bud mass is my guess).
This shit hit yer plants HARD in flower...like nothing you've ever seen before. almost looks like mite damage on the fans...then they fall off. Soon after that..the buds that would have stretched and made colas go "golf ball" like..and everything gets chunky.
Gravity..may harden the bud a bit further. It seems to bring all the nutes into the plant...if you've ferted heavily along the way/prior to application/along with the product it can REALLY burn yer plants.
P Maxx...made may leaves turn colors but didn't affect the color of the bud. Again..this is like the rest of the products...easy to OD/burn the plant
I'm not using them anymore, fwiw.
bt dt