Please also see my in-depth review of the Blurr 2.5m, as these two sizes have quite the same characteristics.
I have been flying the 2017 Blurr 3.5m, in the buggy on flat beach and in the dunes, on various occasions now, and I love it.
A windspeed of 16-20 knots is ideal in the Buggy, whilst handeling gusts up to 24 knots is fine.
I like the fact that when taking off, also whilst in the Buggy, it is quite safe as it does not explode into action, but has a nice smooth power build
up.
The PL Reactor II 3.5m on the other hand is a bit faster and has more pop, which is more risky when the kite is on the ground.
The 3.5m Blurr is naturally a bit slower than than the 2.5m due to size, but still very reactive in steering.
I anyways fly with 15m / 13m lines so that certainly keeps any kite more reactive.
Landing directly downwind, even in its upper windrange is smooth and very controllable.
Taking a couple of steps towards the kite whilst doing so makes it even more relaxed.