Yikes, a revived wellie boot thread so soon after the last one degenerated.
Anyhow, thanks to the excellent review here from MajiKelly I went and got myself a pair of Muck Boots. I've been wearing them a lot in the last couple of months and they really are good. So much better than my old Dunlop wellies that I can hardly compare the two.
If I have any niggles about them it is that I find the sizing a bit generous even though I bought my usual size. A pair of thick socks solves that problem but I wonder if I'll overheat in the summer. The tops chafe against my legs when doing vigorous walking wearing jeans, but this doesn't seem to be a problem with modern fabrics or when wearing thermals under my over-trousers. They can, of course, be rolled down.
Because I work in them as well as walking I got the steel toe capped ones and they are pretty heavy. So I'd recommend that if you are mainly walking in them that you don't get the Humbers.
I was concerned that they might not give good grip in wet clayey mud but they have been excellent and much better than my old Dunlops. I've been regularly walking through mud tracks in flooded fields on London Clay, I've barely slipped at all and the mud seems to fall away from the tread of the boot quite easily. I also walked for several hours through a flooded quarry and I had no problems keeping myself stable and warm. Having warm feet in sub-zero temperatures when wearing wellies is a new and wonderful experience for me.
The padded footbed, support and thermal properties and moisture wicking do seem to do a good job. Far better than cheaper wellies at any rate and my socks don't keep getting pulled down either.
They are a bit expensive but for me the comfort is worth the price.
I'm sure Grubs are fantastic too, in fact I believe that Muck Boots and Grubs are in fact made by the same company.