I traded in my 11000SE for the 15000 and so far I'm happy with it. I can't say I'm overjoyed. I'm not a picture person and it seems to me that there are too many icons that don't make sense to me on the main screen and I'm always fishing for what I want. Also I've had mine in the shop 3 times for the automatic needle threader not working, I'm now waiting for a replacement for it. I also thought the IPad app was going to be awesome, but it's very basic in my opinion.
I really had everything I needed in the 11000SE and should probably not have traded it in, but the deal was to die for.
Overall it's a nice machine and it's so quiet.