I realize this is sort of an old thread, but maybe there is some new information/input on this.

does anyone have different opinions on this from its origination?

do you think it is still a viable tool or is there something comparable?

since the sink is just a Testo gauge interaction is that worth the purchase of Testo over DigiCool?

I have the 523 and am not that impressed. I have been contemplating the 1250's, now there is a new 550.

thanks for ANY input.