Just had some Kasta arrive in the mail, my hot takes:
Berg: Ugly flight path, but the identical on every throw. The lateral miss potential is very minimal, it doesn't have much lateral glide at all. Do I need a shot that looks terrible but lands in the same exact spot every time? Very useful but unappealing. On another note, the Berg is the best forehand roller I have ever thrown. Each roll was straight and easy to put on the ground. Range isn't huge, but if a 100' escape FH roller is in the cards this would be the disc I would want.
Lots: This disc is amazing. It is the longer teebird. Easy throwing with good HSS, but not a huge hooking LSS like a champ teebird. Flies like the best PD's I have ever thrown. Mine has significant dome, but it isn't gross, and it helps it fly well when I accidentally throw nose up. LOVE this disc, will purchase more.
Gryme: Very fast out of the hand with a low profile and shallow rim. Doesn't handle stall very well and is a bit squirrelly. I didn't like it tbh. I like my discs to have similar HSS and LSS, and this one likes to force an S curve. I may have to try the Gryme X and see if it flies more to my liking.