I've got both the digi delay and the dd20 and the dd20 will do everything the digidelay does and then some. the only real things you would be sacrificing as people have said are space and having two delays.

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gear: Outdated
http://community.webshots.com/user/seven1082000
Rig Thread:
http://guitargeek.com/chat/showthrea...threadid=95916
And my music: Halfway house
http://www.myspace.com/theglcc
looking for:
Analog delay
TC electronics D2

4sale/trade
Boss DS1

Done Buissness with:
Aneuretic, guitargeek, Tyler Durden