The Omega-8000 series are very good urban Coin Hunting models, but poor performers for relic Hunting in very ferrous-littered sites. I have owned all versions of the '8000' and also owned the '8500', and of them all my favorite was the good ol' Ver. 4 Omega-8000, mainly due to the more variable Iron Range Disc. adjustment. I used all of the FTP search coils on them and my preferred day-to-day Coin Hunting coil is the round 7" Concentric. If I didn't have that coil the 5X10 elliptical Concentric worked well, also. I also made sure to keep a 5" DD mounted on a spare lower rod for modern trashy places or fitting in brushy or littered areas.
In most urban Coin Hunting places, I also enjoyed slightly better coin depth and better VDI lock-on with my V4 Omega-8000's than I got with my T2's. They were more unstable and jumpy when the located coins were in the over 4" range compared side-by-side with the Omega's. Just find the coil(s) that work well for you, keep your Discrimination low, at about Iron Nail rejection, and work an area slowly and methodically. In more mineralized environments don't use a too-brisk sweep speed. Learn it and you'll have a good Coin Hunting unit in-hand.
Monte