I like the Speedzone but I've not used it for any very long rides yet. Luckily, a 200 usually takes less than ten hours of riding time for me these days. I'll have to think of something else next time I do a 300.
The three line display is probably the best thing about it, especially as you can configure it to show which fields you like - as long as they're not on the same line (it would be nice to be able to show both time of day and distance, but never mind).
It's good for the price though.
d.