Not helium, but I still have a pair of Velomax Ascent Comp wheels circa the year 2000. I think they were even lighter than heliums and have a V shaped rim profile and lower spoke count so slightly more more aero too FWIM. I won a a crit and a couple road races on the college circuit on those with some Mavic Open Pro dual compound tires.
They've held up well. They have some minor cracks at the nipple holes, but they've been there since 2001 and not gotten any larger in the last 13 years. Original bearings in front and I replaced the rear wheel bearings and freehub once. I think its' just a Shimano LX MTB free hub. I use them on my road bike. They ride pretty soft, though not as good as my Zipps.
Heck, I still have a 9 speed Dura-ace shifters and rear derailleur I put on that same bike at the same time to replace the Ultegra that wore out in just 2 years. It still shift OK, not great, but it works so why upgrade. I'll wait until 11 speed gets really cheap when 12 speed comes out.
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