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I've used the Fire XC Pro 2.1 for a long time. It's been a great tire on all surfaces that I've had occasion to use it on - dry hardpack, wet and slick midwestern woods, loose/rocky Moab soil, even on grass dual-slalom courses. The rounded profile provides excellent predictability going into corners, and the stiff side tread provides great hold when you lean it over a little too far.
And the red rubber on the sides looks pretty cool, too.
Got this vest to wear on the morning bike commute, and found that it is the perfect addition for winter/spring running as well...it is the perfect piece to take the chill off the cold morning while still allowing heat to escape when you get moving. I usually wear over a midweight base layer down to 25 deg F, or over a lightweight base layer up to about 40-45 and stay very comfortable at the beginning and throughout my workouts.
Also, the screaming yellow color provides excellent visibility in all lighting conditions - key when running or riding in urban environments.
As many reviewers have noted, I have come across the toe slipping problem. I wear these primarily for commuting (30-35 minutes each way), and even with slight toe slippage, they do keep my feet warm (have worn without problem down to 25-30 deg F), and are easy on and off with my MTB shoes. Admittedly, I have not worn when it is really wet yet, but if it is dry and cold, I think they are acceptable and will be durable.
Other booties have been knocked for wearing down when walked in - I have not had this problem, as the sole cut-away provides ample room for my shoe treads to stick through.
As far as sizing goes, I was between the published sizes (43 - between L and XL), and the L fits quite well - except for the toe problem.
I own a pair of the M225's, which I think is just an older version of this shoe. Excellent fit - I have a very wide forefoot and narrow heel/achilles tendon. Once I put SuperFeet insoles in them, my heel is cupped very securely in the heel pocket without any slippage.
The combination of ratchet/velcro allows for excellent and secure fine-tuning of fit, and the tread (with removable toe spikes) provides excellent traction.
This is my only pair of bike shoes - they perform equally well on the trail, during the bike commute, on long road rides, or during triathlon races (well, they could be a little easier to get on in transition during a tri, but they weren't designed for that purpose). The stiff carbon sole gives me great power transmission for all activities, without killing my feet.