Just took the plunge and ordered a Helix HX, mainly as a backup rig in case the Kemper goes down.
I was an original Helix user on day of release, so will be interested to see how different everything is now, especially after all the updates.
I recall that nothing had the same feel or response as the Kemper, but it'll be interesting doing a direct comparison!
Planning on using the HX as a practice tool when I travel for work as well - the Kemper is a bit too big to lug around..