I have a set of these wera hexes.
I love them, but the only issue I have is the shaft is thicker. This causes issues with certain areas e.g. reaching into fork legs, small adjusters near knobs... where you cannot get the wrench in, or line it up straight increasing chances of rounding out a bolt head.
For most other applications I love these.
Honestly, I would just go the park tool ones. The folding hexes are really really lightweight, but there is no 2.5mm - I'm finding a lot of small adjuster knobs on shocks/forks/brake levers etc as well as bleed ports are 2.5mm's.
But get a set of the standard professional hexes (the P-handles are great, but again the torquing side is short)
HXS-1.2. They cover pretty much everything!
http://www.parktool.com/product/pro...y=Hex & Torx® Compatible Tools#tabbed-section
for the trails I carry a AWS-11 with a small bag containing 2.5mm HEX, T10, T25, and mini chainbreaker tool (for other riders mostly) with a phillips head/posidrive/flat head.
If you already have those, and want something cool... and don't have these already. My favourite hex tools when I worked in workshops, were the 3-way hexes. The 4/5/6 pretty much lived in my pocket.
Just happens they have a fancy 50th Anniversary one... I think I might purchase one of these myself LOL
http://www.parktool.com/product/50t...-aws-50?category=Hex & Torx® Compatible Tools
EDIT: I just found something super cool...
http://www.parktool.com/product/adjustable-torque-driver-atd-1?category=Torque Tools