Bluesbreaker wrote:I thought about the DD-20 as well but I'm not sure whether there's too much "needless" stuff for me. I definitely want a tap function which both (DD-7 and DD-20) have. How easy is the DD-20 to use? What does it offer that you find essential which the DD-7 does not have?
If you want to have the biggest diversity, and if you have enough place for the DD-20, you can buy it. The most essential, additional feature of the DD-20 is - in my opinion - that you can save up to 5 presets. It has several Output settings (e.g. L-Wet R-Wet | L-Wet R-Dry )
In the moment I'm using the DD-20 with R-Dry and L-Wet, at the beginning of my effect section, right channel is for other effects and direct into the main amp(s), the left channel (only the generated Delay effect) leads into another amp. That sounds fantastic!
If you want to play around with your effects or if you want to use different delay sounds (digital, analog, reverse etc.) within one song, with only stepping on a footswitch, the DD-20 is great!
If you don't need these additional features, if you only want a "normal" delay, you should buy a DD-7... its size is approximately a half to a third 
Here are my tabbed songs by "Smokin' Joe":
http://www.jbonamassa.com/forum/viewtopic.php?id=7236I LIKE MUSIC!
