I take online reviews on a site like Amazon or eBay with a grain of salt. A couple reports of hot bulbs? Could be bad bulbs - could equally be someone plugged into a hot pedastal. I've seen some hokey RV setups and never know what someone else is running or deems acceptable.
I have clean power coming in, and see hardly any fluctuation on output voltage. I have sat with a voltmeter and looked at what my coach does, especially when high amp devices kick on (like A/C). But then again, i'm far more concerned about my computer equipment than $20 of LED bulbs.
My opinion is it ain't the bulbs. YMMV - if you don't do your homework on the front side, be prepared to live with the consequences on the backside.