For how much they cost those Hercules things do look rather good actually. Hmmmmm tempting to just buy 4 or so of them to shut the misses up. The ones I was planning to build were going to extend a bit further out from the wall which I suppose will increase the load on the wall rather a lot. Some of the guitars are fairly deep though so too close to the wall won't work.
Got Dreadnoughts hanging on some without any issues. Behind the SG 4.75" Les Paul 4.45" Telecaster 4". The Dolbro has a good 1" free space behind it.