I personally like the new Astrale 8 better as it looks better and appears to be sealed better (not that I ever had any real issues with my older Astrale). The on bike setup is much easier than the older model due to redesigned cadence and speed mounting points.

One problem I have with the new 8 is - I cannot for the life of me figure out how to set it to MPH from KPH. Any help anyone could give me would be greatly appreciated.

The new 8 also has a front wheel speed sensor which isn't a big deal unless you used the rear speed sensor on a trainer during the winter months.