They were nearly impossible to close on any sleeve (e.g., oly, specialty, etc.). Not sure if I got a bad batch but I ended throwing mine away.

I spent ages searching for a leg press/hack squat combo that wasn't too wide. My search landed me here. I really like this unit with a couple of minor nitpicks. The leg press footplate is tiny. Even though both footplates are diamond tread, they're still a bit slick so I had to add grip tape to both. The safety handles are unnecessarily heavy so I had to add grip tape to those as well for my wife. It has an 85 lb start weight with a 60 lb feel weight due to the angle, which I believe is 45 degrees. I prefer a lower angle (e.g., 37.5-ish) since that feels better on my knees. If you're on a budget or tight on space, and not interested in those "compact" hybrids like Force USA, this is a great option.

Super quick and easy to take off the bar. They work best on actual olympic-sized sleeves. There is some forgiveness with other collars and sleeves with wider tolerances, but not with these. As an example, I have a saxon bar from a small company where the sleeve is just barely smaller than a regular oly sleeve and these do not work on that. Bench press? Rows? OHP? These are bangin'. Heavy deadlifts? Some specialty bars? Keep a pair of regular collars handy.

For the price this thing actually delivers. The plastic sleeves leave a bit to be desired but the resistance profile is spot on. I ended up selling it because I hated finishing a taxing set and then having to crawl off the floor essentially.

Everything Curt said below. I've never felt unsafe using it but I use it rarely and it mostly just sits around collecting things to sit on top of it. Very reverse hyper-esque in that sense.

You're not buying these directly from York which means you are prisoner to the secondhand market and will have to hope someone selling them that doesn't know what they are. Otherwise -> $$$. I currently missing a half 55, 65, 75, 80, and 90. I might as well refinance my house to afford those assuming I can even find them. And for those unaware of what these are, they are the heads of old school York dumbbells where the handle has been removed so only the heads remain.

Every grip company has their own version of IronMind's Rolling Thunder, but Arm Assassin to the approach of modularity and versatility. Rather than a single thick handle that spins around the center shaft, Luke came up with a system where you can swap out different thickness handles and pinch blocks, both on the single and this version with the dual handles. For anyone getting into grip training and looking at a rolling handle implement, this and the single handle are all you will ever need.

Every grip company has their own version of IronMind's Rolling Thunder, but Arm Assassin to the approach of modularity and versatility. Rather than a single thick handle that spins around the center shaft, Luke came up with a system where you can swap out different thickness handles and pinch blocks. For anyone getting into grip training and looking at a rolling handle implement, this and the Napalm Nightmare 2.0 are all you will ever need.