A couple of years ago (when I sold my Marshall JVM HJS... biggest mistake ever) I bought a SYN-1 and the Friedman HBE module. The voicing of the module was great, it sounded very thick and saturated, but there were two things that I just couldn't stand and eventually made me return both devices: 1. very high noise floor and 2. tiny, finnicky knobs.
If only they would equip all devices with the stepped controls of the Vai module.