Well, I think so. I spent $185 (including shipping and tax) for it and I am in the process of selling the i3 for $100. For a total of $85 my Probook is now running exactly the same as MacBook Pro's with the i5-2435m
According to Geekbench:
MacBook Pro (13-inch Late 2011)
Intel Core i5-2435M 2.4 GHz (2 cores) 6798
My score for Lion was pretty darn close and my Windows 7 is identical.
I went on Apple.com and configured the 13 inch MacBook Pro with i5-2435m, 256 GB SSD, 8 GB DDR3-1333 RAM and it came to $1999.99 (w/o tax and shipping)
I paid:
Probook: 474.99 (NewEgg.com)
Processor Upgrade: $164.99 (SuperBiiz.com)
Hard Drive Upgrade: 256 GB Crucial C300 $464.99 (NewEgg.com)
RAM Upgrade: 8 GB OCZ DDR3-1333 $199.99 (School TechHub)
Old Processor: -$100
Total: $1204 (rounded w/o tax and shipping)
I saved almost $800 and I also got something that I can tinker with (which I love to do).
Overall, I think this was an awesome investment. But, it wouldn't be that way if it weren't for all the people in this forum who have helped make it happen. You guys are awesome and I appreciate all the hard work you all put in to this laptop.