Stellar!...with SOME rigs
This pedal can sound stellar, but in my experience it has to be paired with right right amp and it also needs a bit of a push. Let me explain.
The OCD is a very uncompressed and maybe somewhat scooped-sounding pedal (think Fender Blackface scooped, not heavy metal). That makes for a wonderful rhythm sound with a big bottom and jangly highs. The problem is those characteristics of this pedal need to me smoothed out or they become grating. When I ran this into my Blackstar closed back combo, it was killer. The Blackstar is inherently dark and boxy, so this pedal provided a fantastic sonic sheen with a big bottom surprising for the small combo. When I played in into my Mini Rectifier, it just didn't sound as good. The Mini Rec's cleaner side is sonically very similar to this pedal, so the two didn't blend well. So make sure you have the right amp for this pedal. However, it may work in a more transparent amp if you use a guitar with humbuckers.
This voicing/EQ can be flubby or spiky if you use too much gain, at least with single coils. Low gain sounds fantastic on the OCD, but it's a crunchy sound and not a sustaining lead sound. The best solution I found was pushing the OCD with a pedal that's dark or slightly compressed to get a lead tone. For example, my TS9, Xotic compressor, MXR phaser, and Xotic EP Booster all sounded good in front. Those pedals really tightened up distortion and EQ. My fav was the Xotic EP, which is a highly colored boost. A clean boost into--or after--the OCD didn't do much for me. Also, the impedance of OCD is weird, so it's a bit finicky where it's located in your signal chain. It didn't work after my wha.
In summary, it's a great pedal, but it needs to be paired with the right rig and maybe needs a push if you want to use it for lead work. The OCD also cleans up fairly well. It's a pedal well worth the price.