Hi guys

I'm using Nikon D5000
I've been offered by someone to change "suka sama suka" with his sony alpa 550

His camera is still in warranty and has been use for only 4 month
My camera is also in warranty and has been use for 9 month

So,the question is can i received his offer or you guys got something better opinion?
What i've heard the performance of sony alpha 550 is quite similar to D90

thanx