Im a huge fan. Being a lazy sod it saves a lot of hassle.
At gigs it has been a godsend. All my guitars go out of tune, (pubs are a nightmare, air con, doors opening, radiators, hot weather etc. Plus I do thrash the strings a bit!). Rather than using a tuner and mucking around its just volume down and one or two strums.Indoors I don't need to unzip the bag, find the tuner, plug it in. Its just one or two strums. As for re-stringing, I hate it! But with this its basically a few wraps,use the locking nut and press a few buttons
The look? Its behind the neck, who notices? I never do.
The curious thing is that those resisting changes are playing a guitar that has changed an awful lot over the years. For me innovations such as volume boosts, coli splits etc are to be welcomed.