I'm not sure they've been around long enough for any reports on longevity. You can try doing some Google searches to see if anything turns up. I have them and they seem to appear to be well made and hydraulics is a pretty basic thing besides the electronic control panel.
Lippert recommends you coat the pistons with dry silicon lube sprayed on a rag when extended for periods of time, I think a week in most normal conditions and every few days in salty conditions. You can find information on their website, which is
www.lci1.com
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2014 Raptor RP300MP w/ Rear Patio Party Deck, Folding Side Ladder, 6 Point Level Up, Carlisle Radial Trail HDs
2004 2500HD D/A CC SB - TTT Mirrors, Prodigy BC, 18K Pullrite Superglide, NEW Fuel Injectors 11/2015 (ouch)