I have a x3 live I have used since 2010 or so. Like it for my solo gigs through my Bose pa. Bought a HD500x and a JTV-69 James Tyler wanting the acoustic guitars mostly. Almost sold the 500x,the factory presets are terrible.Some of the patches on CustomTone are ok. I did watch a lot of videos on both products before and after my purchase. I will say there is a pretty good learning curve to the 500x.
what is rather difficult for me are a solid lead tones. I am a Strat player and a long time Line 6 guy. Have a old AX2 amp.Check out Glenn DeLaune's website he has some usable patches there.
Is it worth the money... yes, are the amps believable? Yes, will they sound good recorded and live? Yes, it just takes a lot of tweaking.... good luck!