I'm looking for a sit-on mower for about a half-acre of lawn - or more
correctly grass - fairly flat but not in great condition, and the
Mountfield 1228M and 1228H seem to be available at a reasonable price. But
are they any good? I've read the other e-mails here on Mountfield, but they
all seem to be about the push or power mowers.

A possible alternative for the same price range would be the Stiga - I think
called a "Garden Combi" - any comments on this one?

I've had electric and petrol power mowers before, but no experience yet on
sit-ons, and would appreciate any advice you can give me.