The ATR has tailwind capability of upto 15 knots (depending on variant), higher than the Q400.
The dry crosswind limit is 35 knots, higher than the Q400.
The wet crosswind limit is 4 knots lower than the Q400, but it's not a significant factor on the whole and is rarely the reason for diverts off the IOM.
There are no performance issues operating into and out of the IOM.
The aircraft is VERY reliable. Relatively few disruptions due to the aircraft or the operation.
If the IOM had a CATII ILS, then the number of weather related diverts would drop by, I estimate at least 75% if not higher. Certainly every time I have had to divert the weather has been significantly above CATII minima.
I 100% stand by what I said, it's the ideal aircraft for island connectivity which is why most island communities in Europe use them (Balerics, Canaries, Greek Island, Channel Island etc etc etc etc)
As has been said, there is a good reason why they've sold over 1,500 of them!
The only problem with the ATR on the IOM that I see if that there are only 2, I think a fleet of 3 or 4 would serve the island much better.