Well Pa is famous for clay, and I'm no exception.
I purchased a MB last year for a small garden 55x25
It's certainly not as ideal as a BP, but it worked quite well (with a scut)
I turned over the sod last Oct. and let it lay until early April.
Turned it over twice more, disced and it looks darn good for a first year garden. It's easily as deep as most tillers will get you.
I wouldn't want to till an acre or more with it, but for small jobs, and about $150, it's a useful tool.
And it did create a lovely trench for potatoes.