Reverb is not generally high in guitarist's consciousness. Most amps have a reverb of some type, mostly springs, and they are usually adequate for taking the edge off an other wise very dry sound and are generally just left at 50% or full on forever.
The Mad Professor Silver Spring brings the attention to detail and whisper quiet operation that is somewhat of a hallmark with almost studio fidelity reverb. No booming 'sproing' here.
Whether it is set to a short room sound or a huge hall with the reverb tone on maximum treble for a plate sound, the reverb sound really is very, very smooth and is top quality.
The absence of ANY alteration to the original guitar tone, with the effect off or on, is also very noteworthy. I have had the experience with quite a few delay pedals recently that, whilst offering a fabulous array of echo types and features, sadly alter the guitar tone to a noticeable degree. NONE of that with the Mad professor Silver Spring.
One small footnote to all this glowing praise. In my experience, reverb sounds fabulous in the bedroom or the rehearsal room and the studio. But live? I have rarely played a single venue where the invariably awful acoustics of hard reflective walls have not produced a huge booming sound man's nightmare. In these circumstances, the last thing a guitar player is even more reverb to finally wash everything all overboard.