I'm thinking about buying a Lyman 4500 Lubrsizer from MidwayUSA. See below link.

http://www.midwayusa.com/viewProduct/?productNumber=655459

I will be using it for sizing and lubing the following bullets from Lee 6 cavity molds (Non-TL).

http://www.midwayusa.com/viewProduct/?productNumber=569185
http://www.midwayusa.com/viewProduct/?productNumber=458304

Does anyone have any feedback, hints, warnings, or recommendations?

I have used the older Lyman model 45 and 450 which are essentially the same with the latest having some new improvements in handle and linkage. It also has a built in heater where the older models you place the heater between the table top and bottom of the sizer. Lubes I use are soft enough that a heater isn't required. Some harder lubes work better softened with the heat. First one I bought in middle sixties and its worked without problems every since. Have picked up several on eBay so don't have to change back and forth when switching calibers. Last few I looked at have sold for nearly new price so thats not viable anymore. Come to think of it since this stampede for reloading supplies started haven't seen any for sale on Ebay. Lyman sizing die and top punches are interchangeable with RCBS. SACEO are there own entite when it comes to dies and punches.

I use one of the older 450s and I can't say that I have any complaints.

Seems like most people like them.