Hey man, check it out.... I've owned a Boss DD-3,
a Boss DD-7, the new Hardwire series by Digitech's Delay... and a few others, granted these are all digital, but when I got the Carbon Copy it's the first time I ever actually went WOOOWWW, and could notice a CONSIDERABLE difference in clarity warmth and tone...
I'm not going to gush about how much I love the pedal, I will just say it's my favorite pedal BAR NONE, the mod feature on the pedal adds a slight chorusing sound to the repeats and makes it very lush sounding...
In short, for the price, unless your going to bump up to the next price point the Carbon Copy is absolutely AMAZING, buy it and thank me later, don't even think about anything else... it's small footprint is amazing as well, so much beautiful tone in such a small package, it's true bypass, and the LED's are extremely bright and cool looking (I'm an LED nerd).
So yea, just buy it, this is all my opinion obviously, but I know super delay freaks who have several Eventide Delays ($400+) on their board and they still rave about how good the Carbon Copy is for the price...
The one drawback of the pedal is the knobs are large, and are bumped easily, I wish MXR made some type of bumper like the Hardwire series does that goes over the knobs so they cant be moved, or maybe a switch to disable the knobs and keeps them where they are when you engage the switch, but this is only a problem if you are gigging, when I pack up my board they tend to get moved, but luckily I like the way the pedal sounds with everything at noon so I dont have to mess with finding my sound again when it happens...
I always do this, say I'm gonna keep it short and then I start to ramble....
Buy the pedal, you wont be dissapointed....