My sister has a Mid-2010 MBP 13" MacBookPro7,1 MC374LL/A. Over the years it has become unbearably slow with each upgrade to latest OS X. So last night I backed up machine to time capsule, installed a 256GB Samsung 850 EVO, used a bootable USB drive for fresh 10.11.2 installation (came pre-patch with 10.11.2). Then on first boot used migration assistant to restore all her old applications, settings, etc. WOW! It's like a new laptop! I also have a 8GB memory kit due to arrive later in the week - not sure its even necessary considering how well the factory 4GB is working. I wasn't sure it was worth upgrading this old of a machine, but it was well worth the $70 SSD investment. Should be able to get a couple more years out of it. No problems replacing 9.5mm HDD with 7mm SSD since its held in with screws.