but I didn't liked them because I play heavy rock, and for heavy rock you need a really good amp with a good quality of sound

The reverb is great, sounds clear, almost spring quality.

Everything else is fine and the build quality is excellent.

Great quality sound and very light

Despite poor build-quality (I went through four Crates), I liked the way the Crates sounded.

Because I like the Helicon vocal pedal that has its own preamp (also check out their Perform V), I can put a mic into the L Line-In (which pans a mono signal to both sides).