In reply to a crap climber:
I'm actually in the process of reviewing the G-Summit in this less-than-ideal Scottish Winter season (although looks like winter is back!).
I've have also used the G5's in the past, and would recommend these as they fill the gap somewhere between the G Summit and G tech as for as I can tell (I may be wrong in that as I haven't used the G Tech. I noticed that the G5 are currently on sale at many retailers, so may be worth considering before you drop a lot on the likes of the G Summit.
For what you have said, the G Summit will be ideal for V and the occasional VI - they will keep your feet warm at long belays and still provide the technical performance you are probably after. For VII and above I'd imagine you will want a more nimble and low profile boot like the G-Tech (the G Summits can feel pretty chunky at times). For Alpine Spring/Summer depending on what your objectives are, they could be a bit too warm for this.
Like everything, and particularly footwear, the suitability will come down to fit. One thing that I have noticed is that the powerstrap at the shin needs to be tightened really tightly on me (I have thin legs) to maintain a solid fit when front pointing. Unfortunately, this means there has been a bit of digging into my ankle here which is a bit uncomfortable. Although, this may not be the case with you. For this reason I'd recommend if you can try before you buy.
These are however the warmest boots I own, great for winter belays and could certainly be used for some bigger cold summits in the alps etc.
The G Summits deep-lugged outsole (similar to that of the Aequilibrium) is also interesting although I'm not 100% sure that I'm sold on this. It's great at biting in and braking although it doesn't feel as wide and stable as sportiva's old sole on the likes of the G5.
I'll have a more detailed review on site hopefully in the next couple of weeks.
Post edited at 13:46