I think any controller other than a generic one would be classified as decent.
As for the performance goes, since it does have to write the same amount of data to both drives, it would decrease performance because the process of the data being written has to be done twice.
If RAID 0 is hardly ever advisable, why was it invented? I mean, if you think about it, it really dosent serve any purpose at all. Well, actually, come ot think of it, it does make sense for two drives to act as one. It would make some things easier. Well, I guess i answered my own question on that one. I got RAID 0+1 setup, which offers a good deal of fault tolerance. I want to setup raid 5 though. That would be tight.