I picked up a used RCR2660 in excellent condition. I will say this is the most heavy duty 60" cutter I have ever seen. The gear box is massive and everything on this cutter is built HD. It runs super smooth. No vibration at all.
Most of the rotary cutters I found out are rated at 1" cut capacity. The 2660 is rated for cutting up to 3" material. That's why I went with it.
Even used cost was almost double of what I could have picked up a new 60" cutter from one of the local chain stores for but after seeing the difference in their light duty models and this one the cost was well worth it.