I'm keeping up with hard on GH2 quite alright now
just get my frets mixed up sometimes.
Also I do advise GH2 before GH3. The GH2 experience is so much more solid tbh and the notes don't lag. The wireless guitar is a good investment though, for convenienve and because the les paul is a better shape than the x-plorer.
The Rock Band stratocaster looks better than both of them though.