I'm using this between my Mexi Strat and my Vox Lil' Night Train amp. It's a very "bright" combination, and this compressor helps attenuate this a bit. The effect is very subtle, you'll have to play around with the controls a bit and see how it affects the sound to get an idea of what it really does. Also works great as a boost for when you need that extra oomph.
+ Sturdy build
+ True bypass
+ Versatile (can be used as a boost)
+/- Subtle, transparent compression (Some might favour this, others might want compression that is a bit more "coloured", depends on the individual preferences)
Minor cons:
- Mediocre switch (for comparison, my TC Electronic Ditto looper has much smoother action and very quiet "click" when stepping on it)
- I've seen prettier pedals :)
Does a great job for the price, though maybe not the best introduction to the realm of compression for beginners. Overall, a good product for a bedroom player as myself.