I can't attest to the TSR3 but I can to the TSR4. With the front and back weights left in the standard setting, for me anyway, it was pretty difficult to hit, have to hit it right on the screws or it doesn't stay in the air very long. However, with the weights swapped it's the best driver I've ever hit. I went with the TSR4 because I wanted a lower-spinning driver that was also forgiving. The TSR4 has the same face tech as the TSR2 where it's hotter and more forgiving across the entire face compared to the TSR3 which is more concentrated to the sweet spot. I hit the TSR4 more accurately than my old TS2 and about 10 yards further. Putting the heavier weight in the back in the TSR4 (which they call the TSR 3.5 setting) to me is where it's at.

I love your answer! I have the TS2 today and i ordered the TSR4 this week! Looking forward to delivery! :) Thanks!

Awesome, you'll love it!

Hey Daniel,
Both heads are fantastic with lower spin across the faces. Of course 3 is geared more towards dialing in the back weights to where a players needs it. The 4 head is low spin head but is absolutely more forgiving than the i3 head. With the two weight system you can move more weight to the back and it then essentially becomes a i3+. Hope this helps!

Thanks! I went with the TSR4! :)