I bought a couple of Apple Toshiba SSD's that were pulls from the MacBook Pro on eBay. Find a reputable seller.
They work fine, the synthetic benchmarks are only part of the story, the gains made are due to that 90% of the SSD/HDD access is for 4K blocks and that is where the seek/write latency (moving the heads on a HDD) comes in which is on average around 10 - 13 Ms for a mechanical HDD and next to nothing (nS) for a SSD.
The only time the SSD performance gets important is when you do large sequential writes (video processing? Don't know.) but for "normal" usage these Toshiba's work fine. Have one in my Mac mini at the moment and the other is a spare and likely to be used when I get my next machine. (better grab them when they are cheap).
More than pleased - had before an Intel X25M G2 80 Gb and had no troubles (sold it with my Mac mini 2010) but a later Intel 320 has been reassigned to a Windows laptop - was not impressed in the Mac with it.
I bought a Apple SSD 256 gb from ebay but when i put it in my Macbook 2011 it only did SATA2 link speed and trim was not enabled. So how do know that its the right one that works with SATA3 and trim capable ?