This is a question that will surely get a lot of answers across the spectrum. I have never had one, never had a problem. Lucky? Maybe, am I in the market for one? Not at this time.
Look at the map in my sig, that will tell you how many different states/campgrounds I've been in since 1989, and I can say without reservation that at least 95% of the Ca. sites and 100% of all others have been full hookups.
Let the debate begin
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2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.