I had the 13" 2010 1.86 4GB 128SSD GB for 6 months. I had no issues with the machine, mostly use office, and iPhoto plus iMovie. Surf, email,
I recently traded in to Powermax, for a 11" i5 4GB 128SSD. As far as the above functions that I use it for I really do not notice any speed difference. I did just create a iMovie and it was probably quicker on encoding the video but for the 12 or so I do a year, it hard for me to judge. Of course if I was really wanting to push the video speed, I should of went to the i7. But again for the 12 times a year I am good.
Powermax gave me $800 for the old and I paid $1200 for the new. I figured is was as good a trade as I would find with out the efforts of trying to sell it myself.
I am digging the 11" form factor and the screen size seems great. I love the backlight keyboard and did not realize how much of an advantage that was until I started using it in certain lighting conditions.
I wanted the Thunderbolt setup. My plans are to upgrade my 2007 iMac to a Mac Mini next year and I wanted the same TB setup for both.
I am happy with my decision but I could not justify it for myself just by going from 13" to 13". So the change is size for my commuting needs was how I talked myself into it.
Otherwise they are both great machines. The biggest thing is Backlight keyboard and Thunderbolt. Speed performance is not that noticeable for me because I really did not push the old machine nor will I push this one.
Hope that helps.