My experience mirrors all the others here. I've had mine for 6-7 years now, and while it isn't perfect for corn, it's MUCH MUCH better (easier) than doing it by hand. By the time you're shucking ears, you don't even notice how "unprecise" it is with corn

I don't thin the corn... it does drop double at times, but I haven't found it to be an issue in the long run, big picture.
The more finely tilled the soil, the easier it is to push, as you would imagine. The marker doesn't give as wide of spacing to the rows as I would like so that I can get the troy built between the rows, so I just parallel it by about 6-8", it works. Whatever side you have the marker on, the planter will tend to pull to that side, so you just have to "steer" in the opposite direction to keep your rows straight.
Like one of the other posters mentioned, it really is quite "dangerous"!! Our garden grew from 25X50' when we first bought the house to nearly 100x100'

, which is really too big for just our TroyBuilt Horse tiller!! Next year it will likely grow wider by another 30' or so. Maybe we're nuts! So far this year, I've got about 900 feet of corn planted (9 rows) and we're planning on another 8 to 9 rows of late season corn that I'll get planted in another week or so. It really does make putting in a large garden quite easy! Also, so does my 6' KingKutter tiller

... Couldn't do it without either one.
Have any of you guys planted lettuce with your EPGS? I've had the seed plate kit since I got the planter, but I've only used it for corn up until this year. Don't ask why, I don't have an answer. But, this year I used it also to plant a row of peas, and it handled those very well. I was looking through all of my seed plates and saw that I had one for lettuce... but unfortunately, I had already planted our lettuce the old fashioned way
... along with Okra (doh!)... and spinach (doh!)
So, how does it work, has anyone used it for lettuce?
Later this summer, we're planning on doing a "fall garden", and I'm planning on using the EPGS to put in a few rows of turnips and radishes.