there was a new one at NAMM the 616 model I believe. looks to be a MXR Carbon Copy killer. street price is said to be less than a 300B. I wanna check that one out. but i was planning on a 600B. the dark models are too darn warm IMO.
it does have trimpots inside so you can tweak it some to oscilate or have more time.
I thought it had another that delt with feedback...i may be wrong.