I'm not sure if there was a thread for this already - I think its been discussed before but perhaps in another topic (perhaps another forum?)
Haskell and Tindall on their latest podcast (link below for those who haven't seen it) discuss (amongst other things) suitability of 4g pitches. Tinds admitted his experience of them was limited but didn't enjoy playing on them and Hask hasn't met a player yet (obviously not a massive survey) that enjoys or looks forward to the prospect of playing on them.
The host for the show this week (Vernon - Alex Payne was away skiing) quoted that there was no evidence of there being more injurires but what injuries there were, were more severe.
So does that imply there has been a limited study?
Hask also pointed out that players at no time had been asked about having to play on 4G pitches. Do you think more research will take place before another club installs one?
They also questioned the argument of lower maintenance costs and whether they do actualy get used that much by external community clubs (another reason for having them). Both Hask and Tinds were fine with the hybrid pitches as they offer the best of both worlds.
The section starts at about 20 mins but feel free to watch Hask rant on about other things and also have another sly dig at Wasps.
https://www.youtube.com/watch?v=RTzrxOy_iY8