So, while of course their simulations of some name brand pedals don't sound exactly like the real thing, for $1 each, you can audition them, use them once on that one thing where you think they need it, or decide that it sounds awful and never use it again

Some of the clean amp simulations are really good

Single, portable box with lots of usable effects and a few good amp simulations

I promise you won't be sorry \m/CONS