Anybody using these critters? I've been looking at loop-master.com with great interest, trying to figure out the best way to go for switching between rhythm/lead and maybe adding in a couple of effects in separate loops. They certainly appear to be well-made and reasonably priced products, but maybe not quite as flexible as one would hope (can you use the same effect in more than one loop? Doesn't look like it). Any insight into loop switchers and their general usefulness?

I've had good luck with both my 2 Radial Big Shot loop switchers. Here: http://www.tonebone.com/re-bigshot-aby.htm
Inexpensive too, you can get them around 70 bucks or so.

I've had great luck with my Loop-Master Clean/Dirty switcher. I don't need to use one effect in two different loops as you mentioned, but it's a total life saver when switching between two different distortion tones, one of which involves a stack.

The price is definitely right and the customer service is awesome. I'm sure they'd help you out if you presented them with your multiple loop-single pedal question.

Only downside from my end is that wait time is a bit lengthy. Not a huge deal at all, though, considering that you're getting a handmade and customized piece of gear.

I have the same experience as Jensen5. Loop-master is great because you basically design what you want. A little wait time but the price is right. I bought an ABC box last year for my acoustic rig. I use it to switch outputs depending on what instrument I'm playing (Larrivee, National, or Weber mandolin). Works great.