Electro Harmonix Holy Grail Nano Reverb

This small pedal is catchy as it appears simple to use, with only one know to control to amount of reverb. However, I find that past 11-12 o'clock it sounds far too metallic and treably, almost like a fuzz / distortion effect. It seems to loose control of the signal. For my normal use, I do not go past 9 o'clock. The flange feature is useless to me, and probably to most people, unless one is interested in that particular effect. I prefer the Boss reverb pedal, with separate controls for MIX (dry versus wet signal portions) and DWELL (the actual amount of reverb). Besides, the Boss pedal keeps the original signal tone, without loosing control. One additional negative feature (for me at least): the pedal switch is hard to engage and originates an audible metallic clicking noise. I prefer a smoother switch action. I believe that one should go for either the Boss (a bit more expensive) or for the cheaper Beringher units, that are indeed quite satisfactory sound-wise.