Okay, here's the real schiz nizzy from my point of view. I have used the Serratus Genie (Long) almost exclusive over the past 2 years. I have used it for 1 and 2 day trips over Stuart's N. Ridge. I have used it for a 3 week, late summer, backpacking trip in the Sierra. I have used it as my only pack on Rainier (August). Basically, I have used it almost everywhere. When did I not use it?
1. Rainier attempt in the winter. not enough room for base camp gear. I did use it as the summit pack on the attempt.
2. Ski mountaineering trips. No ski slots.
3. Friday night karaoke. No pack needed.
This pack is actually comfortable. It took a few times for someone to convice me to try it, but once I did, I was a convert. It is the most comfortable pack I have ever worn which is saying alot considering I have a few McHales.
I recommended this pack to a friend as a summit pack for his (successful) attempt on Denali last year. Upon return, he raved about the pack. "Carried it all over the mountain".
It's LIGHT and packable. Plus, it only cost about $40 with shipping from MEC. So, even if you don't like it, you are not out TOO much dough.
I have not tried the little Lowe, but I think the Serratus has more room.
I have tried the Lafuma 32. It SUCKED. It was the absolute most uncomfortable pack I have ever worn. It just plain hurt. I lent it to a few friends and they absolutely hated it as well. Jim Nelson is the only one I have evern know who like the La Fuma.
If your looking for a summit pack go SMALL.