I can't reply with any first-hand knowledge to your query for alternatives, but since you're asking for any input:
I have the QD on my Cobra (classic, or cobra 1). Just about exactly 100 dives on it, no problems whatsoever.
My wife's Cobra, bought used, also has the QD, probably more total dives than mine, also no problems.
It does marginally improve on convenience in the expected ways, and if I needed to replace it, the replacement would have the QD.
I don't recall reading anything significantly negative about it here or elsewhere. Doesn't mean that doesn't exist.
I did a search, and found this older thread, where post #4 suggests an anecdotal problem with a QD "on a different Air Integrated computer",
not even necessarily a Suunto. Most other posts in that thread reported no issues.
http://www.scubaboard.com/forums/computers-gauges-watches-analyzers/287589-cobra-2-problems.html
This thread suggests a few hypothesized problems, but seems to put them to rest.
http://www.scubaboard.com/forums/co...yzers/5775-suunto-cobra-quick-disconnect.html
Pretty much every mass produced product will have some incidence of failure in the field population.
I didn't think the QD is generally regarded as troublesome. What complaints about it were you referring to?