I have those fitted as well as OE top bearings. Some scoffed at their use as under compression of suspension the stub axle lifts off the rebound spring, conveniently forgetting that it's under compression by inner wheel when cornering as it limits roll. I know it lightens steering though.
See this video (posted many times before) which illustrates front suspension operation.
I think I'll plump for some lower bearings as I'm only after lighter steering during manoeuvring so would think that the rebound spring is still engaged at such a slow speed and would at least make a small difference.
