I have a Jacobsen 548 slit seeder which I like fairly well. It is offset and also sets back fairly far from the tractor - makes the
B2910 alittle light in the front without the loader. It has a similar set up to the Landpride OS-15, except no cultipacker in the back and no tires on the side. I have been satisfied with the overseeding jobs it does. I wish I could crank up the rates alittle more though.
I also just bought a used Land Pride PS1572 (72" primary seeder) I have alittle work to do on it this winter, but am very excited about seeding some new construction jobs and some overseeding on sparse lawns with it this Spring. My Kubota has no problems with the weight of this one. It has two cultipackers (one in front of the seed box and one in back of it).
I really don't think you can go wrong with either Land Pride or BEFCO. I would suggest pricing around and look for a local dealer willing to work with you. Parts can be a real challenge on some of these products. I just replaced the tines on my Gill pulverizer - wow are they proud of those things!!! I have replaced some things on my Jacobsen as well and they are also very expensive!!!