I've tried only the Boss NS-2, the MXR Smart Gate and the ISP Decimator...
The ISP is incredibly musical and transparent!!!
With the NS-2 (that's
MY opinion, sorry Santa) the attack and the tone are sucked.... but you have this great system of internal loops.
The Smart Gate do its job, nothing more, nothing less...
MY opinion is if you don't have the use of the NS-2 loops, for the same price I prefer the MXR...
But if you have some few bucks more, you can take the ISP with ears closed!!!
You can't find a better stomp box noise gate (nomwadays).