I have no experience of using them (I like traditional wooden hives), but to me they scream out condensation problems. And I doubt whether they would last as long as a wooden hive.
Not for me.
I had a dirty brown coloured one it back in 1991 as a trial thing , fitted it on a standard hive floor board set up , it cost me an arm and a leg and was always wetter than the wooden hives ( I'm in the UK) .
I doubt it would have lasted much longer than the four years I had it, unlike my western red cedar self made hives that will still be going strong in 30years time if they are looked after .
On reading all the posts it looks like the open mesh floor seems to have cured the wet problem .
What sort of price are the poly hives nowadays, mine cost me well over £300 in 1991 ( £900 ish @ todays rates) ?