In reply to Chris the Tall:
I've owned a Mid-fat 2.8-3.0 hardtail for a good while now as a second bike. They are a lot of fun, especially in wet autumn and winter conditions, but let down at the moment for me by the robustness of the tyres - I must have been though about 8 split carcasses (but then I do tend to ride it nearly as fast as my full susser). The plugs into splits have got me home a few times.
There are some tough tyres out there (tried a few), but they weigh far too much and kill the bike on any uphill tarmac/grinds.
Currently waiting on delivery of a Maxxis Rekon 2.8 to see if that has a better balance of robustness to weight. WTB have also brought out some Enduro casing versions.
I'm running tubeless - which is a must to get the weight down and allow the lower tyre pressures that make these bike so much fun.
Another issue is getting some of the tires (especially Trailblazers, which have wafer side walls) off wide rims, e.g Scalpers - this can almost be impossible as they seat so bloody tight. I've have had to cut one TB off the rim. Not what you want in the middle of winter, in the middle of nowhere .....
Post edited at 10:31