Jaarus you must have been reading my mind when you started this thread!
I've been shooting X7's all summer (many thanks to SimonW for selling them to me!) and I've just started shooting 80 yards with OK results, but nothing fantastic. I hit my first 2nd Class score with them last weekend. I've really enjoyed using them, and would highly recommend them to anyone just off a beginners course. Mine reach 80 with no problem at all, and there's loads of room on my sight for a 100yd setting too.
I've been toying with looking at getting either some ACCs or Nav's and using the X7's indoors (our club still continues shooting outdoors all through the winter), so it's very interesting to hear the thoughts on things like 2 buttons, and the ease with which ACC's or Nav's will reach 80+ yds.
Now the question remains - do I buy a set of expensive carbons to use through the rain, frost, and wind in the winter, or wait till next spring?