The ones with the full necks very good -although the neck fastenings on all of mine (I have 6!) are awkward to thread through - fine for mine who are out 24/7 so keep their rugs on but they'd do my head in if I were removing rugs everyday!
I got one to try on my rug destroying TB mare - it was about £60 and a 1600 denier so figured it was worth a go, and its brilliant...!
Hasnt ripped, leaked, fallen apart no matter how hard she has tried and its kept her warm and dry all winter so far - very pleased and planning to get another for my other horse.