i use a line 6 pod for all my guitar sounds and think it is pretty amazing. never tried the rack one but if you can afford it that is the way to go...xlr in/out etc. downside is you have to buy the footswitch separately which is pricey. i have tried a beringer vamp and personally thought it was rubbish...didnt sound very good and was tricky to use...the one i tried only had an up/down footswitch making it pretty much impossible to use live. iain