I've had Kumho KW27 fitted for around 150 miles. 9-5 Aero, Eibach suspension, 225/45/17 V XL.
On my way home there's a junction where it's a sharp pull out on an incline, and on the first day (cold & damp road) I noticed there was a lot of TCS action without me particularly trying (after about 30 miles wear).
I thought it may be just the release agent, but as I drive more, I find that the TCS light is merrily coming on not just when I floor it from low speeds, but also from around 50mph. It wasn't happening with the Toyo Proxes I took off, nor do I remember it happening with previous winter tyres (Vredestein Wintrac Extreme, still got a pair on the rear). I'll persevere and see how they do. Maybe it's a trade off for snow traction...