It depends on what you're trying to accomplish to decide if it's worth it, I guess. I play a tour issue deep face 2016 M2 T3 because it helps me flight the 3w in the correct launch window off the tee. I hit 15 degree fairway woods too high from the teeing ground. The trade-off is that the M2 T3 is harder to hit off the fairway, but 9/10 times I'm using it from the tee and not the turf, so it's worth it to me.
Where can you buy these as I’m looking for one and didn’t think TM did a 13 degree fairway?
They're tour only, but can often be found through a few places that sell tour issue gear.
It's too bad TaylorMade doesn't sell a strong 3w any longer. Callaway still sells their 3+, as do other brands, but they're hard to find if you want something recent from TaylorMade. I switched back to my old 13 degree V-Steel this year. The shape of the 2016 M2 T3 I had been using just didn't fit my eye. I prefer the M1/M3 shape, but it's difficult to find a T3 in those models without paying an arm and a leg.
I have a high angle of attack on tee shots, so I hit 15 degree fairway woods too high off the tee. As I stated earlier in the thread, the 15 degree is fine off the turf (perhaps better), but 90% of my 3w usage is off the tee, so I'd rather optimize for that shot. If TaylorMade released an M3 T3 tomorrow it would be an instant buy.