I had the 500 with 115's and 410's. The 15" speakers sound better to my ears than the 10's. However, with the 200c and one 15" extension cab, I got as much, to my ears, volume with the 200c WITH the extension cab as with the 500 head and 2 cabinets. I'm sure the 500 is louder, but I couldn't tell the difference. Don't misunderstand me, I think they're both amazing little amps and anyone would do well to have either or both, I did. I just really prefer the 200c and the 115 cab for sound, price, and convenience over the 500 head and 2 cabs. With the 500c, you're stuck with 10" drivers and mixing them with 15's doesn't seem to sound good to me. If you like 10" drivers, then the 500c is an excellent choice. I have 10" drivers in my VB810 cabinets and with the Ampeg or Marshall tube amps, they are mind splittingly loud, low, and clear. But man, I'll never get rid of the Rumble 200c!