For me, the WOT is a must have, good coverage and target seperation is pretty good. It goes deeper than the stock 10.5, perhaps by an inch, but that's a lot. However, often I've been caught out where I would have needed to squeeze through tight places like thin strips on flawn, between poles, close to curbs/concrete (which has big metal in it) etc. I'm also not sure about what I'm missing in trashy areas. Smaller coins may not be suited for this coil, it goes alright on smaller coins and have found small silver but, perhaps a smaller coil might do better?
Many have given good reviews of the coiltek alternatives, it is the only brand I'll trust as Coiltek are pretty much close to minelab. For me, the WOT is a much much better all-rounder than the stock 10.5, I don't think the stock goes that deep and it doesn't seem to seperate that well.