The thing with SSDs is that they have extremely fast, nearly non-existent seek times. The rest depends on the controller design and here's where the differences between manufacturers come up.
Marketing types like to boast as high numbers as possible so many an SSD could be, and have been, designed to achieve high sequential transfer rates. That is not the most important figure however in normal use.
What makes a system responsive or what can become the bottleneck that kills a system using a bad SSD is a slow random write speed of small files. When your OS does anything, it writes small stuff all over the place. An SSD controller that hasn't been designed to optimize this aspect of performance can start causing hang-ups (this is called stutter) of up to half a second or more! Sure, mechanical spinning hard disks are slow too, but that was eventually solved with ever-increasing large write caches. If an SSD design isn't mature and it doesn't do what must be done to get around the weak point of SSDs just like hard drive manufacturers fixed theirs, you won't be enjoying your SSD. Imagine opening a browser, Skype or any program and wait for a full second every time there's a small write to the disk!
I recommend reading this Anandtech article, especially the latter parts about the new OCZ drives and how the new
new Vertex dodged the stuttering problem that threatened to make it just as unusable as the previous models:
http://www.anandtech.com/storage/showdo ... i=3531&p=8
Now the new OCZ drives would appear to be practically as fast as the Intel SSDs and are looking like winners.
Intel's SSDs work great, you can trust that, but their pricing isn't exactly consumer friendly. I'd like to have a mature, well designed SSD as an OS and software drive for the speed and reliability, but for now I'll stick to my 1 TB Samsung Spinpoint F1 inside a suspended Scythe Quiet Drive - it's inaudible already, so only the performance and reliability aspects remain. I will be getting an SSD at some point, but for me it won't be for the purpose of silencing.