Yes, I have an American Elm bonsai. It started from seed probably 18 years ago or so. There is a huge, beautiful specimen growing across the road from us and it's seeds scatter far and wide, sprouting in our front yard sometimes. I had dug up several of them and grew them larger. One in particular, I wired, pinched, did roots, etc....as it grew. It was in a formal upright style and I was so pleased with myself when it was about 16 inches tall...so pleased until I realized that it had absolutely no taper to it. So, the following spring, I did a trunk chop on it. By then it was about 8 years old and had about an inch and a half caliper at the base of the trunk. I replanted the trunk chop at an angle and worked on regrowing a whole new tree. Every so often I would pick a new side branch as the new apex and cut everything above that point off....gradually building a decent taper. It was about 10 or twelve years old when it finally began to look like something. And then I got a job.
This is not a good thing for a tree that needs constant niping and pinching and attention to keep it from "getting away from me" because now I didn't have the time for all that AND my other trees too.
It did get away from me and suffered through several attempts at restyles and more chopping. Last June I left my job and stay home now. The elm is still with me and if I had spent the time on it that I should have, it would be one gorgeous specimen now. Instead, it is grotesque in a neat sort of way. I am trying to develop decent branching on it again. They do make a terrific bonsai if you don't neglect them. But don't rush to put it into a bonsai pot until you have gotten most of the development you are looking for. The do respond well to trunk chops at the correct time of the year, they bud profusely and you have wonderful opportunities for ramification and branching. Just don't let it get away from you. I feel like I am starting all over again with mine......