Rab Drillium or Slipstream jackets

Hi bit of a long shot but does anyone here have any experience of either the Rab Drillium or Slipstream jackets? I've read lots about the drillium and its won tests etc but don't know if it might be a bit big and bulky to put in a hydration pack (planning on getting a 19L dakine nomad admittedly). Can't see one in person so looking for personal experience?
The slipstream is smaller and my second alternative but i've not read any reviews of it.
price isn't a worry but can only be rab at the moment due to a lovely discount
thanks
The slipstream is smaller and my second alternative but i've not read any reviews of it.
price isn't a worry but can only be rab at the moment due to a lovely discount

thanks
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I've worn it for adventure races, biking in the Highlands, running and general day to day wear. It's not let in rain yet, but it has begun to wet out after about 6 months heavy usage. I reckon that's just the eVent needing replenished with some Grangers and a warm iron.
If you've read the reviews, you'll know the hood is gash, but also you should note that the collar is quite high as a result of having a hood.
I have an 18l North Face bag I wear for riding, and it'll stuff into that quite nicely when it's too dry to wear it. eVent doesn't get too warm for the most part, it breathes a lot better than any other waterproof I've tried.
What price can you get it at? I paid 130 quid for mine.
Scott Spark 20 the softtail
Cannondale CAAD9 the roadie
Alasdair, its not a public offer but i'm looking at around £80 or less...