Thanks. I would only use it to mow the field edges and roadsides. I wasn't thinking of gathering it up but it sounds like I'll have issues if I don't.It's works great if the sickle is sharp and guards are in good shape, and no dead grass to cause a plug. Or, a good wind from behind, or half laid down tall grass that falls forward. At least on the first cutting of the year.
If it's not gathered off the field, the next time you mow, the first cutting can give you fits, but that even happens with a PTO driven mower.