New Bivvie - Which one?

Now i've decided i'm going to be spending more time on the bank i want to upgrade my bivvy. As the summer ends so does the good weather so comfort is going to become more of a factor. I want to upgrade from my slow erect dome bivvy to a pram hood style, quick erect bivvy. The one i've got my eye on is the JRC STI 1 man twin skin at £140. Unless anyone has a better buy for this price should i go ahead and get this one? I'm looking for something with the complete package i.e. groundsheet, twin skin, pram hood style and one that doesn't cost a bomb, £150 being my upper limit. Any advice welcome.

I've got achub cyfish 1 manherecomes with all the bits; similar to jrc but can be used single skin, zip off front umbrella styleor use the mozzy front. A bit heavy but good quality; fun to get it all back in the bag too.

carn't beat jrc ui got a jrc 5000 2 man and its awsome i used it last year in the snow and it was perfect

heard good things about the jrc bivvies.

and the opposite about the trackers