Don't use Hydrofloat myself, but it should be fine in these here parts. The problem with the line as I understand it is due to freezing conditions, which breaks down the line quickly. This hasn't endeared the line to the float fishing community back east, which is a much bigger market and where you'll hear most of the complaints.
Quite a few problems with the hydro float in my very brief experience with it.
1. The one that has been mentioned most often, the coating is not durable. It comes off and bunches up when tying knots, bobber stops, etc. It can also be encouraged to shrug off by sticks, rocks, gunnels, undoing backlashes, and other things that tend to abrade a fishing line from time to time. The strength of the line seemed significantly reduced without the coating.
2. Even though it was quite buoyant, it seemed very sticky to me. For some reason it doesn't seem to break the surface tension of the water nearly as well as braid or even mono and i found mending it quietly and accurately less than ideal. Again, braid = far superior with regard to mending characteristics.
3. The diameter of the line is quite large when compared to braid. It is still thinner than most mono's of a similar strength rating, but it is nearly twice as thick as braid of the same poundage. I didn't do the math, but I remember getting a surprisingly small qty on my viento.
4. I found that when the line was put under tension it tended to cut/wedge into the line on the spool causing it to bind up. I know this can be a problem for some with braid, but I have only had it happen a couple of times, usually when pulling on snag and using the spool to hold tension on the running end rather than my hand.
I can't think of a single good thing to say about the line really. It sucks.