I just recently got back into the hobby and upgraded to the 900. The 6 inch coil is fantastic but the 11' coil in my opinion is too wide and has a hard time with separation. I bought the coiltek 10x5 that's actually 9x5 and it seems to be the go between for more coverage and good separation. The 11' coil likes to chatter a lot and make you dig DEEP iron.
On the flip side, I have found my best coins and a lot of civil war relics other folks have missed since purchasing it.
It is a powerful machine but like others have said, the EMI rejection could have been better, and the 11' coil should have been elliptical instead of round.
Get it!