I love my gamma it's a coin monster. My only dislikes are the amount of EMI chatter I get when near power lines or networks or other disturbances and the fact that it's not waterproof. My partner with an ATPRO just pulled a nice early 1800s button out of an area I've hit hard with the tek. She dug it on tone not TID. It was also at 8". In trashy areas my tek has great recovery speed but seems to get confused when targets are masking. I have trouble in trashy areas with it. If the targets are clean and stacked she'll do well but if they're cruahed, foil, or rotten metal it plays he'll trying to sort it out.
I have the stock coil on it now. I have River access and would like a waterproof detector not only for inclement weather but to hunt the river and banks. My other gripe is the lack of intuitive tones you get with the gamma. 4 max and yes they vary in clarity and strength but I'd really like a more tone based detector for relic hunts and keep the gamma for coinshooting.
My idea was the T2 or ATPRO but the at is winning out given the waterproof feature.
I liked my land star and the 505 is my backup for when someone wants to join in on hunts. They are both great for bullets and coins for what they are. Started with a land star and returned it due to chatter issues which were intermittent and deemed a manufacturers defect. The only reason I really went with the gamma is I had a bunch of bass pro gift cards and they matched the lowest online price I could find on the gamma. It was also the highest end model they had in stock.