My experience with the Ungers is that they snag and rip very easily. Went through loads of them over the last few years.
Bought myself a pair of sealskinz from Go-Outdoors (I know you can get them cheaper but I was desperate) and i absolutely love them. Very tight fit unlike the Ungers which seemed to be bulky in comparison.
A bit pricey at £25 but they have lasted me well over a month so far.