I have a KN7000 and bought a PSR2100 as a second keyboard recently. It is quite similar to the Tyros. I've wanted a lighter weight keyboard for several years. The PSR2100 is only 23 pounds, sounds great, has a lot of good features. It's my first Yamaha keyboard since the late 80's, and I'm impressed!

In answer to your question, it all depends on WHY you're buying a second keyboard. The Tyros isn't real heavy, but I don't like it having no internal speakers. Also it's quite a bit larger in size. So it didn't full my needs.

Just my two cents on the subject.

I suspect you might be happy with either one of them.

Marilyn