I use Glenn's patches on the Boss GP-10, play live with them, and they sound GREAT. Worship team, so we play different music every week. So I listen to the guitar parts, and then try to match them sound with my guitar and gear. With the guitar synth, it's a little easier than with a regular "analog" guitar, but the Helix and GP-10 each have their strengths and weakness.
Just got the Helix this week. So I plan to download his Helix bundle this weekend.
Why? Could I do all of this for myself? Maybe. I'm an electrical engineer and I make my living designing electronics for a +$1B/yr company.
But I don't want to. The way I see it, five minutes spent twiddling and tweaking is five minutes I'm not playing guitar. Plus I do that kind of thing all day--Uncle! So when I get home, I just want to PLAY. I'm not into the gear for the gear; I'm into the gear for the TONE. But thank God not everyone is not like me, otherwise we would only have the factory patches and amps!
So that being said, Glenn's patches & amps are PRICELESS to me. He has obviously has spent lots of time building them, even figured out how to do his own IRs. and if you consider how much work they save--the price seems more than fair...