I may be late to the game but I had a E50 with rear weight, which gave specs similar to E55. Really liked the E50 as it was powerful for its size, good visibility, came with boom hydraulics for attachments, able to work in tight spaces and I never had any concerns about reliability or getting parts. If you can get a good deal, go for it if it is the size you need.
I sold it about a year later to up-size slightly to a Yanmar 80 which is just more capable all around, especially since I use my excavator to clear land more than anything else. I have a Bobcat and Yanmar dealer just a few miles from me so that was not a concern. Both had their versions of quick exchange coupler that works fine, I believe the Yanmar is just a little easier to use.
The bigger Yanmar with more buckets was about the price as the E50 with less buckets included.