I still have the winter tyres on as it's only a couple of weeks since we were still getting snow. I'm thinking of just leaving them on this year
I've swapped from winter to summer for the past two years but as it's now June I can't make my mind up as to whether it's worth it. The difference in fuel consumption is negligible and I'm fairly sure the winters are quieter
My 'company' car also still has Michelin Alpins on from winter, which are now at their limit (4mm policy on Ambulance RRV) and there has been a very noticeable difference this week now that it's a bit hotter. Very squirmy under load and a huge increase in ABS kicking in, particularly noticeable in dry conditions.
It's not something that would be an important consideration for me under normal conditions in my own car, as I wouldn't be driving anything like as quickly but there is a difference.