Slightly brittle, but not as bad as Roland GP-16. Digitech Legend 21 Easy to use and program. Good clean sounds with classic and recognisable overdrive sounds. No real complaints. Overall, good and versatile.
Overdrives are fairly dirty.
Has chorus, but no delay or reverb. This is similar to the digital effects half of the Digitech GSP-2101. Quality of effects is good, algorithms and programmability are unnecessarily complex. Despite the large number of possibilities, I actually find it somewhat restrictive. For example, there is only one algorithm with Delay, Reverb and Chorus, and in this algorithm, the delay is limited to 800mS. Probably more suited to vocal PA effects than a guitar processor.