I agree about the Trim, but that's about it. SSD scales really well
However, if one SSD fails or the RAID fails - poof - you've got NO data
RAID A-RAM SSD ULTRA II 115GB 2.5" MLC, 285/ 275MB/ s = $400 for 230GB.
V3LT-25SAT3-240G.OEM 550 / 500 MB/ s = $375 for 240GB w/Trim
IMO I'd prefer a single OCZ Vertex 3 240GB V3LT-25SAT3-240G.OEM
OCZ Vertex 3 240GB single SSD -> http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=100008120%20600038500&IsNodeId=1&srchInDesc=Vertex%203&bop=And&ActiveSearchResult=True&CompareItemList=636|20-227-707
I recommend that you read the following article which compares single vs RAID in SSD -> http://www.tomshardware.com/reviews/ssd-raid-iops,2848-9.html
; note this is only one page but it's pertinent to 'real world'.