I have run a Great Plains 3P606Nt for the last eight years with my business. They are fantastic. It takes a while to figure out proper planting depths and seeding rates but they are sturdy and I have had almost no problems with mine. The downside is cost. A new one will set you back about 20K the way mine is set up (with native grass box). So, unless it is making you money, it can be hard to justify having it just for plots. If you get a 3 point model like mine, make sure you do plenty of research on your tractor's hydraulics to ensure it can handle the weight. You will also need to think about front weight on your tractor to balance the heavy drill on the back. I just keep a loader on the front of my Kubota M7040 and all is good that way. You can go with a wheeled model but I need the 3 pt option since I trailer all over the place doing plots for customers. Moreover, the 3 pt. is so beneficial in tight spots where you can just lift and turn. One of the key things on them is maintenance like cleaning/oiling chains, greasing zerks, keeping proper tire pressure in drive wheel, vacuuming out seed boxes after use, etc etc etc. Also consider getting the option that allows you to add tractor weights to the drill if you anticipate drilling in tough soil. Let me know if you have any other questions.