I disagree on the soft RAID vs. hardware RAID (if by soft RAID, you mean the md layer in Linux). I'm not a fan of hardware RAID, in general. I wrote the following ages ago on Slashdot in response to the same kind of disparaging statement about soft RAID:

The data integrity benefits are still present, as are some performance benefits in some circumstances (in fact, Linux RAID is demonstrably faster in some workloads than a top end Adaptec hardware RAID controller, though this is the exception rather than the rule)

That said, I hate pretty much all RAID controllers (whether software or hardware). Linux software RAID means that I can drop the disks into any PC and access the data. Every RAID controller from Promise, Adaptec, and Tektronic requires me to use their disk format, and if I lose the controller I lose the data until I can get another controller. Sure, in high availability environments, you keep a spare...but with Linux software RAID, every PC in the office is a spare controller. That's my kinda redundancy. I've even had two identical Adaptecs with different firmware lead to pretty massive data loss during a server migration. Thankfully there were good backups. I've never had similar problems moving Linux software RAID disks into a new Linux box.