I've got an early 2011 13" MBP with a 120GB SSD, formerly part of a DIY Fusion Drive, that I'm trying to install Yosemite on. Every time I try to install from my bootable drive, it hangs at the exact same point: ETA 11 minutes, last log entry "PackageKit: Extracting file:///System/Installation/Packages/BaseSystemResources.pkg (destination=/Volumes/SSD [that's my drive name]/.OSInstallSandboxPath/Root, uid=0)". That's happened even after I erased the disk, and also after I reformatted the drive. I left Internet Recovery to run a download/install overnight, but I woke up to a gray screen that I couldn't escape from. I tried remaking the bootable drive, but still no change. My latest attempt featured an install initiated from the HDD (that's now plugged in where the optical drive used to go), and that hung for literally two hours. What do I have yet to try, or how can I find out if there's a legitimate hardware problem? (A recent Verify Disk claims the SSD's okay.)
Install the OS on to each of the components of the "DIY Fusion Drive" if the system can install and boot from each, you have ruled out a hardware problem with either of the components.
I would contact the vendor about the problem. It sounds like you have a bad block in the SSD that the SSD controller doesn't recognize.
I read a thread (somewhere...forgot where) where some guys SSD would block at the exact same point every time he tried to do a clone on it. He tried reformatting it and the same problem occurred. He ran Scannerz on it and found a bad block there. The problem was, the SSD controller wouldn't recognize it as a bad block, which is basically a bug in the controller. The guy ended up sending it back.
Possibly the vendor may have some special initialization routines that may clear the problem up.
The 2011 MacBook Pro models has/had some issues with SATA 3.0 6GB drives (which the SSD is most likely) in the 2nd (optical) bay. Read the OWC blog entry about this problem.