given that you buy it cheaper, sometimes close to half price, it is feasible in the end to buy two, so once one dies and you replace it the cost will be the same or very close to the same as buying a newer one in the first place.
Unless you care about quality of course, although all 4 above mentioned are so close who cares.
Also, DVD burners are so cheap now life span is probably anothe rone of those "who cares" caus eyou can buy a new one in a year or two, and even cheaper then.
support is not comparable as each company deals differently with customer care and we have no feedback yet on either competing brands, none I seen so far
Anyway, lets not jump off topic