I'm not sure how this would have sounded if I hadn't opted for the break in. I have experienced drastic improvements in other speakers as they break in, however, and wanted to start using the amp in question right away.

The first gig I used the amp for was a delight. The sound and response from the amp was wonderful. Exactly the sound I was looking for--especially compared to the stock speaker I had in my Fender Vibro Champ Reverb. It went from a decent amp, to a perfect amp.

Got the M10C for my Marshall Class 5, fits perfectly, sounds excellent.

It's hard to rate the break-in service because I don't know how would the speaker sound otherwise, but I can tell it sounds good out of the box.

Nothing was wrong with the OEM 12-65 ROLA but I have always wanted to try this 12LA Jupiter .. I was very impressed with the build quality .. I had this bunt in .. sounds fantastic very articulate upper mods and tight bottom .. highly recommend Jupiter .. very responsive customer service as well ! 5 stars !

Decided to upgrade from original 8” speaker in my old Gregory “widow maker” type amp (made safe with isolation transformer). While it only outputs about 2 watts., there aren’t a lot of options for 4 ohm 10” guitar speakers. I really like the Jupiter caps I’ve purchased, heard good things about the speakers so took a chance. And guess what? My little amp sounds glorious - bigger, louder and with way better note definition when amp is cranked all the way for saturated overdrive at bedroom levels.
PS The Jupiter break up in service was also a big plus - no way 2 watts were ever going to break that speaker in.
PPS Have to admit that green finish is mighty handsome.
Hank S