I haven't seen this in stores around my area yet, so I can't say.
I will say that I've checked out their Fender Deluxe modeling pedal and was more impressed with it than I thought I would be, so judging by that, I think the design team working on Boss' digital modeling stuff has come a long way. If the RE-20 turns out to be a refinement of what Line 6 offers in it's DL-4, then I think it could sound really cool.
Here comes my rant:
I love delay. I love tape echo and analog delay for many reasons. I love early digital delays for many reasons as well. As someone who came of age when digital delays were just becoming affordable and you could still get Echoplexes and Space Echoes for cheap, I was able to turn my delay/echo obsession into a collection.
Cut to 2007, I've had two unrelated musicians in the studio who were very talented, very hip, very tone-conscious, but in their early/mid 20s say to me, "that's the first time I've ever played through an Echoplex" when I pulled one of mine off the shelf. One of them had actually never seen one before and was amazed by how it worked.
I think that there is an obvious cult/fetish status with things like old tape echoes and other stuff that seems so archaic in this digital age, and some of it is for good reason. Though many of them don't survive 30 or 40 years, if they've never been maintained, the ones that do usually sound really cool.
However, I think a lot of younger folks who weren't around for the days when everyone was trading in their Space Echoes for the new blue Effectron racks, all they have to go on is what they read. The fact that the Line 6 delays are modeled after things like Echorecs, Space Echoes, Tube and Solid State Echoplexes, etc. is what some people have to go by. "If they modeled it, it must be cool!"
This isn't a knock against anyone, but it's the reality for some people. I've never driven a '56 T-Bird, but they look cool and some people really love them, so it must be something I should want.
Get to the point, Rog. Okay, so I think that people who have memories of the old Space Echoes, and moreso, those who are using them today will never be truly impressed with any digital simulation. It'll never be as good as the real thing. You can argue that unless it sheds simulated oxide and makes a squeaking noise in the background, it'll never be as good as the real thing. To those who are looking for a cool alternative to a Boss DD-3 pedal, I'm sure that the RE-20 will probably be a very cool pedal.
The funny thing is that I can see us all in ten years, lamenting the good old days of the Akai Headrush, complaining that the new plug-in version doesn't sound as good. That'll be around the same time that someone releases the new BlakDat plug-in to give you that vintage 16-bit Blackface ADAT sound.
Roger