I've been using software RAID with Linux on and off since 1998-ish and it has *never* bitten me in the behind. That said, the 3Ware controllers are so cheap these days I just find it easier to buy one of those and let the card do all the heavy lifting so I don't have to worry about all the software RAIDisms. Cheers,
yes, Linux software raid for raid1, raid0, raid10 is pretty safe.
I would not bet on linux software raid raid5 though. I must say I have never used it but I have heard plenty of horror stories about raid5 with Linux software raid code. Maybe things have changed now.