I'm waiting to see what the Lenz is like to use.I thought the LH100 with the firmware 3.6 was surprisingly good and a lot easier to use, even if the hardware needed updating. I did some investigation last year of handset systems last year (I was worried about the long term future for my LH100 etc) and ended up finding a cheap Uhlenbrock Daisy II on eBay. It's not perfect (the highest functions can't be toggled), but the ergonomics and usability are very good indeed and probably better than anything else other than perhaps the new Piko handset. If the LH101 gets close to the Daisy II then it would be a worthwhile upgrade.
Having said that, I do think Lenz could have gone a little further and the ability to assign icons to functions so you know what you are triggering is becoming a necessity I think.