i've used enclosures with the combo prolific chipset (PL3507), works well.
there was a time when these chipsets were new, and oxford made a name because theirs worked better than others. i don't think that's the case with current chipsets - if it supports 300gb devices, it's probably fine. still, people get hyped about the oxford brand, so you'll pay more for it.
older usb/1394 enclosures used seperate chipsets from seperate manufactureres - one for usb, one for 1394. if anyone really thinks this single chip prolific solution is bad, show us.
as far as hot/not, $35 is the price. $20 is hot.