I have one my Son bought for me about 4 or 5 yrs. ago new. At first, I didn't like it, and I had put a good 7 or 8 hundred full tilt H110/296 jacketed loads through it, but it felt sloppy, and didn't seem to be timed very well.
So I pulled the side plate off one day and discovered lots of metal filings, some were piled up under and around the hand, machining derbies I assume. So I rinsed it out with acetone, then blew it out with air, and lubed all the contact surfaces. After reassembling it, I took it out for a test drive with my usual H110 loads and it functioned 100% better, timing was spot on, and lock up was nice and tight, accuracy was also very good.
I really like my 608, and I think they are a solid wheel gun. Taurus sometimes gets sloppy with their work though, so a little tuning can sometimes be necessary with them.
GS