software

I found one at a great price in mint contition.
How does it compare to a marshall cab for example, quality wise?
Would it sound good together with my jcm800 2210?

bumb

Cabinets are just another link in the sound chain. I think the Laney cab that you mentioned should sound fine with your JCM800.

Yes but i wanna be sure that it would make this awesome amp justice, if you know what i mean.

Well, not to put Laney products down, their cabs are not the best choice of speaker cabs imho. But then again, a Laney cab is not really a Laney product as they use HH speakers.

I have a Laney GH100L with the HH-Loaded 4x12 cab (300w model) and the cab really lets down the great head. The HH speakers are too thin and fizzy when overdriven, and have no real depth/tone clean.

My advice is to steer clear of the Laney HH cabs in favour of Marshall's celestion loaded ones etc, but check out their GH100/50L heads, wow, they eat Marshalls for breakfast!