I have two 128GB in raid. It is pretty swish. After Win7 install I had 220GBish free space, so plenty to play around with. My only complaints would be that stability is a little less than 100%. Occasionally upon restart Win7 fails to load certain things (like AMD's CCC) or hangs in loading. Although, this is probably my fault as I run a very stripped Win7 with most unnecessary services disabled (gotta get the most performance possible!) not directly the SSDs or raid.
The other issue I had was with virtual memory. Obviously you do not want virtual memory using the SSD as it will kill the life expectancy of the drive massively. Win7 gets a little pissy if the virtual memory is reallocated to a volume other than the "C:" drive. You might have to check that Win7 has applied and maintains this change.
Personally I have Steam on the SSDs and use "mklink /J" to link the actual folders to my main hard drive. I like this set up because Steam is notorious for not liking being installed on any volume other than the "C:" volume. Also Steam installs to the SSD which invariably means a quicker download and install times. For games that are read/write intensive I leave them where they are (Crusader Kings II for example). All other games I copy to my non-SSD "E:" volume under "\Games" and then use the "mklink /J" command to "trick" Steam into believing the files are still on the "C:" volume. For example:
mklink /J "C:\Program Files (x86)\Steam\steamapps\common\saints row the third" "E:\Games\Steam\steamapps\common\saints row the third"
The folder structure doesn't need to reflect Steam on the other drive like mine does. For my own mental clarity I left the Steam folder structure the same on the "E:" volume. I have other non-game related folders similarly linked.
After moving and linking you can check which folders are linked and which are physically on the "C:" volume by looking in properties, linked folders should be 0KB in size if done correctly.
The only problem I have encountered is Valve Source games which do not use a folder structure, such TF2. These games usually use .gcf files directly in the "steamapps" folder. You could move and link the entire "steamapps" folder or try "mklink /H" to link the files individually. I could not get it to the "mklink /H" command to work and left them as is. They are only 4GB or so on out of 240GB, so no big loss.
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