I've been a member of JamPlay for ... eeeek! ... 4 years.
It's a great site to learn on IF you find a teacher you can connect with in the genre that you're intersted in.
When I joined there, I'd taken an interest in getting into blues in a serious way - including original style of blues, not just blues rock. They have a teacher Hawkeye Herman, who learned his trade face to face from players like Son House, Brownie McGhee, Bukka White, Mance Lipscomb, Furry Lewis, and Lightin' Hopkins. Good credentials - and his immense enthusiasm and teaching methods taught me a huge amount. Also encountered a teacher called David Wallimann who was able to explain modes in a way that allowed me to play such a hugely bigger range of music - he totally de-mystified what until then had been a baffling concept to me - in 2001, David won first place for the Tal Farlow French national jazz contest which gave him a full paid scholarship to the CMA school of modern music in Valenciennes, France wher he graduated specializing in advance guitar with honors - again some good credentials. Also found a blues teacher there that got me understanding how to play proper blues slide for the first time.
Now having said that, there a lot of other teachers there with big followings who are good teachers for other pupils, but I don't connect with them. If they were the only eachers on the site - I'd not still be a member, good as they may be. Similarly a lot of players will not connect with the likes of Hawkeye Herman and David Wallimann the way I did. So it's very difficult to recommend a teaching site, or instructor to anyone else! They do have a lot of teachers and a lot of genres so I feel that increases the chances of finding a teacher that will suit you.
It's not really possible or fair to compare a huge guitar teaching concern like JamPlay with someone like Robert who produces some really excellent lessons in an easily understandable way - but he's one person, rather than 60+ teachers at JamPlay. I would say that if I'd encountered Robert 4+ years ago and started learning blues through his lessons it's quite possible that I'd not have joined JamPlay.
