ES100s are good tires, but mine have been VERY loud as of late. I've got roughly 20k miles on them (no autox or track events). They grip well, have a decently stiff sidewall, and are really good in the rain. I speak from experience in saying that you won't get anywhere if you try to run them in the snow.

These will become track tires and I will give the MXs a try sometime this year.