I'm not a Line 6 rep or anything, but I'd say it's probably about a 99.9% chance the sales guy at your local music store was talking out his butt.

Your local guy just wanted to sell you something - and since he doesn't understand and hence can't demonstrate Line 6 stuff he told you whatever he thought would turn you toward something he prefers to sell. He's full of cr@p.

He's probably getting money back or points on a similar product from another manufacturer.  Or possibly he's trying to unload some other inventory that doesn't sell...