My HP 1810-24g has never rebooted, crashed or gone stupid on its own. Its fanless, runs silent and cool. Mine actually sits inside a small kitchen-style "upper" cabinet in my garage with nothing but three 2" cable ports for ventilation - the garage gets below freezing occasionally and over 100F during parts of the summer. Its a rather harsh place for computer equipment and its never even blinked.
I consider it highly recommended and believe its more recent brethren (the 1910-24g Patrick has) are similarly solid performers. I've never put a Kill-a-watt on it but the nameplate spec says 30W max. I doubt it runs max.
It will be for sale soon - got a new switch as a "Christmas present":
Cisco SG500X-48. I'm also downsizing for power, turning down the Juniper EX 10Gbe switch and moving my four active 10Gbe circuits onto this new little monster. Nameplate for this is 60W max, which is about half what I had from the combined Juniper EX (90-100W measured) plus the 1810 (30W nameplate).