This review is actually for an e55 but very similar to the e50.
I had a 430 zhs for 4 years that this new machine is replacing.
Originally I was not sure about the switch until I demoed this machine for a day. In-frickin-credible! It's only about 6" wider and a couple inches taller than the 430 and about 4000 lbs heavier but it is 4 or 5 times the machine. Great reach and incredible power in such a compact unit. We ripped out some stumps that we would have had to really fight with on with the 430, effortlessly.
It's really quiet and comfortable and stable. We can lift boulders that our t190 can't (must be about 4-5,000 lbs) with the thumb and reach all the way out and swing the housing without getting tipsy. One very sexy machine! Cost was about $80k CND with steel tracks.