Got a reverse rotation Landpride here. No complaints. I tend to run the tractor in low range and just let it work. It's kicked out head sized rocks with just a 'chunking' sound and no damage to the unit. If anything, it churns the soil almost TOO fine so I may need to speed my tractor ground speed up a little.
NOT cheap but seems durable.
As advertised, it'll take the grass/sod and put it under the ground and churn stuff fine enough that NO second pass is needed, unless you just want to deepen the till. Last year around here we had a dry spell and the clay soil was about like concrete. Generally I'd make one pass set at 3-4 inches deep and then a second pass as deep as it'd go just trying to reduce strain on the whole rig.
Before I got this tiller I'd worked the garden with a walkbehind tiller. MAJOR effort. This year, it's just gonna be a real pleasure to till things up. Should take about 15 min to do what the walkbehind took 2 hours to do.