Love this thing...!
This is an incredible sounding piece of equipment! The rotary Leslie effect is perfect and even the smaller cabinet has an incredibly rich sound. I don't have a full sized Leslie to compare it to, but to my ears its sound is incredible. I was glad to discover the grill cloth doesn't just cover big rectangular openings, but covers louver-like slits just like the older Leslies. This along with the diffusion cones on the treble horn creates the sound that Don Leslie intended. In the old days we ripped off the cones and removed the back panels using the back of the thing as the front to eke out the last decibel from the 40 watt amp, but we lost some of the subtlety of the sound. I'm sure some Studio 12 users will do the same thing (especially since the controls are on the back - but the manual warns us that removing the panels will void the warranty and cause possible injury - I suppose by leaning in too close and having your nose clipped by a spinning horn), but I'd guess the 100 watt amp can keep up with a lot of guitar amps.
I've always loved the sound of the Leslie (who doesn't) and back in the '60's I made sure to add a Fender Vibratone to my setup. I was finally able to get a 147, but looking for more power and portability I got Yamaha RA 70, later I went through a few Motion Sound amps, and ended up with a Ventilator. While the Ventilator is great for playing in a loud band, in a quiet setting it never sounded right. I realized I was playing less organ in those settings because of that and knew I needed a real Leslie. The Studio 12 looks great - I guess they were painted black, but mine has charcoal grey plastic like coating that looks kind of like the old Fender Tolex and it actually seems to sparkle under the lights. They say it's heavy, but it weighs the same as my old keyboard amp and 2 guys can easily carry it (the handles snap in place when not in use so they don't rattle when you play). They say it's expensive, but it costs about the same as Fender Super Reverb - expensive, but not outrageous for a quality piece of gear. If you love the sound of the Leslie and you don't have the room or money for a 3300 a new 147 and you don't want the headaches of an old 145, you gotta check out the Studio 12!