I know this thread is quite old, but I thought I'd come to the defense of the F2 for anyone else who stumbles across this thread. IMHO I think the F2 is one hell of a detector for the money and easily a match for the 250. I had it for 12 months (recently upgraded) and it paid for itself 4 times over. I found a stack of predec coins, but this machine also excels at chasing goldies. It is really light, has a super fast response and best of all has a Visual ID display that gives you a great idea on what you are going to dig. If the ID says 40-42 then you know you are digging a 20c piece (most of the time). The f2 with the 4" sniper coil is a killer in trashy parks. As with all detectors, it takes a good few months to learn what the detector is telling you. It's not a depth monster, limited to about 4-5" depth depending on your dirt but most coins are well within this range. I have used the f2 on the beach but you really need to dial the sensitivity back meaning loss of depth. This would be the case with most vlf detectors. From what I've read if you are 100% beach on a budget the bounty hunter seems to do better.
There is a 5 page forum post on findmall.com from F2 users who are very happy with their detectors. Any failure to find coins with the f2 is definitely not the detectors fault.