I can't remember how many sleeping bags I've got through over the years, but one thing is certain - some perform much better than others, and most performance is down to the quality of materials and the cut of the bag itself. Being 6'2" doesn't help as I've had to squeeze into a few and got cold feet as a result, but the Voyager 600 coped very well with my height.
I've been testing the bag across the UK during the summer and autumn of 2013 and it has done a good job. It compacts very well and lofts quickly when unpacked. The half length zip saves weight, but still allows you to get in and out without too much effort. I've tried bags with a tiny 6" zip before and found that my broad shoulders makes entry and exit a bit of a challenge..!
Like so much in the Terra Nova range, it has a reflective strip fitted. This lies down the left hand side of the bag and at first I wondered what it was for. When you're in a pitch dark tent using only a head torch, you can instantly work out which way up the bag is, rather than fiddling around looking for zips etc. At first I thought it a bit of a gimmick, but it worked very well on a recent trip to Mt. Kenya. Now before you go screaming that a 600 gram bag is a bit light for such a trip, you're probably right..! It's temperature rated for +10oC (Comfort limit) / -5oC (Extreme), but I found the bag kept me warm enough, particularly as I was keeping weight to a minimum - packed weight 0.6Kg (1lb 5oz).
The trip was very wet and foggy, but kept in a dry bag, the Voyager did an excellent job. The high quality White Goose Down is much more to my liking than any synthetic material because of weight to warmth ratio and sheer pack size. There's no need carrying anything to big or to heavy on the mountain.
Coming in at £230.00 some people might think steep as there are many other bags on the market, but as I've already mentioned, its quality, pack weight and performance are difficult to match on the market...