If you're a reloader, it's worth a look, esp. if it's priced right.
Be aware though, factory ammo is EXPENSIVE, and much less available, compared to more conventional cartridges. It does give a boost compared to a regular .270 Win, but, realistically, on smallish, thin skinned targets like deer, the difference in velocity and energy is largely wasted. An eye opener for me was to compare drop tables for the two .270's, Win and WSM. Out to even very long distances of 4-500 yards, the difference is almost negligable, and in my opinion, if you have any business shooting at those distances, a little more drop isn't going to bother you.
All of that said, I have one and really like it. I got an excellent deal on a left handed model 70 in .270 WSM and have been shooting it for about a year. I do reload, and actually load mine to right around regular .270 velocities, 130 grain bullets at about 3000 fps (chronographed). I shot the biggest deer of my life last November with it and it (the deer) dropped like a sack of rocks. (Though in truth, at 30 yards, a .22 probably would have done the job)
In short, if it's a steal, go ahead. If you reload, go ahead. If you just really want it, go ahead. Just be aware of the ammo availability/price issue. You might also make sure it will feed rounds properly from the magazine. Reportedly some actions have issues with the relatively fat cases.