all my horses have them. i love them and the added bonus of being breathable is she wears 24/7 even though shes comes in at night and so shes always cozy.
Yes I find PE rugs when wet are very heavy when compared toHorseware or Fal rugs. Even when dry I think they are pretty heavy, I always think they must be heavy to wear as well
My horse has one- which he wears inside and out. Great fit, nice and deep. It is quite a heavy rug but doesn't rub him , which Horsewear and Mark Todd rugs did. Love it!
they are a bit heavier to lift than other rugs but they are a thicker rug, theres not that many 450g out there... mine are always dry by the morning but i do leave them on o/n. and as said by others, never had rubber shoulders or mane yet!