Review on Enhance Raspberry Pi Performance with LoveRPi Heatsinks by Jeff Drollinger

I haven't done any major overclocking on my Pi3B, but under load these heatsinks have helped keep temperatures noticeably low. The glue on them made the heatsinks slide a bit after application. Maybe they got stronger after a while? I didn't want to put too much strain on them in case they fall off. My Pi is currently at a 90 degree angle and they work great in that orientation.