I have had no issues with the old round tray Lee unit. I think I broke either a handle or a link once. As I still had all the pcs from a couple of the worn out units, and apparently can't get links for them anymore, I splurged for a 21st Century unit that reuses the round trays. They also make one to work with the new square Lee tray. Or will supply their tray.
They really are a good unit, All the benefits of the Sinclair or K&M, but---you have the tray, so you don't have to handle primers.
Reuse the Lee shellholders, the old trays and spring.
They are not cheap, under 100.00 landed here though. I've used the RCBS universal and a Hornady, still have the RCBS, but the Hornady got file 13'd. I should have sent the Hornady back, but, I tried to fix it instead, and gave up on it after an hour or so's work. I couldn't hone the barrel of the body far enough down to fix it with tools at hand, and that bore and the tray install groove needed a lot more work to keep the neck from sticking in the body when trying to get the shellholder in or out. It was pretty sad.
Their QC on that one was non-existent.
I would definitely recommend taking a look at the 21st century unit though. It's worth the money.