I have a set of Hydroedge tires on my 99 Intrepid, and although I find they
give me a very secure ride, I think they have an issue with going out of
balance frequently.  I was told by a tire dealer (although Michelin thinks
he's nuts), that the tires should be re-balanced every other rotation or
20,000 km.  Well, Michelin thinks it's nuts, but I had to have the front two
re-balanced after the last rotation with less than 8,000 km on them.  I'm
not sure how good they are in snow because I bought them last spring in dry
weather, but I do know they are very good on wet pavement.  I live in
southern Ontario and I feel that these tires will do very well in city
conditions, but would be inadequate anywhere north of Toronto after a snow.
They are definitely not snow tires.

I disagree.  The performance of a tire changes through-out its life and
you simply need to be aware of that and accomdate it.  Dry, hard surface
traction is typically better after at least half of the tread is gone
whereas wet weather traction gets worse with wear typically.  If you
want optimum performance, you will have 50% of the tread shaved off your
new tires, drive them 5,000 miles and then get a new set.  Most of us
can't afford that, so we simply adjust our driving style as the tires
wear and don't try to drive 90 MPH in standing water with 3/32" of tread
left.  I routinely run my tires to the wear bars with no problems.

Matt