Marvel Based Sata III drives are slower than the SF22xx based SATA III drives, BUT are more probmatic. CG is not as good on the M4 as some of the other Marvel based SSD, I think the Intel 510 is better and possibly the Plextor M2 (But Plextor m2 is rather low on random 4K read writes.
Now on raid:
I've used raid almost exclussively since mid 90's - Not one problem. Stopped using when I started buying SSds as I see no benifit. As Compusivebuilder indicated; the Possibility of a drive failing thus lossing all data is higher - It's just that, a possibility and as all disk drives should be backed up, I would not be concerned. (Note the problem is not that half a file is on one disk as 3/4 of all files on a boot/program drive are on one or the other drive - strip size is typically 128 K.
To use raid0, or not is highly dependent on what you are using the drive for, If boot + programs then NO advantage. If the raid0 drive is to be used for working with LARGE video files, large spreedsheets, CAD/CAM drawings, and/or spend a lot of time editing large jpeg Photos, then Yes Raid0 makes since. These are large files that take advantage of fast sequencial read/writes.
Remember Raid0 significantly improve Sequencial read and write (Least important for a boot/program drive, Most important for LARGE file manipulation. Raid0 does NOT improve access time, and very little to no improvement in random small file read/writes.