Good solid amps. The older ones with blue carpet have black mesh metal speaker grilles. The last generation of them have the silver metallic 'grid' covering the speaker. Actually they no longer make Yorkville Bassmaster amps, they are now called Traynor Dynabass & are pretty similar. And yes, if you want to gig/jam get the 200w version.
Fender MIA Club Member #33 ~ Yorkville/Traynor Club Member #1
Rickenbacker Club Member #3 ~ Gibson Club #265 ~ G&L Club Member #6