I've been using this pedal extensively for the last two years, reharsals, live and even in the studio; it just delivers a great sound.
This pedal is good, so good infact, that even if you set the threshold so that the compression doesn't kick in, it still does something very pleasant to your sound.
Compression is not an "effect", though you can use this very model to "smooth and round" the sound of your bass, if you're so inclined; and it does it in a most natural way.
When switched off, being true true-bypass, it doesn't deteriorate your signal whatsoever.
This is a great buy. I use it with its power supply, never had any issue (and I use it a lot) nor the need to change the tube which, it has to be said, it's not there to provide a fancy light to your pedalboard and, by the time the need to replace it will arise, it'll be an opportunity to experiment a little.
Overall, this is a high quality product, it's sturdy, it's durable and it sounds pretty darn good!