I also have one of those flat motorcycle scissor lifts. Is there a good way to tell the difference between the new one vs old one by looking at them? I plan on picking one of these up eventually, but I'm not now sure what the difference is between new vs old? There are cheap Chinese knock-offs on eBay for around $50 but I've read the lift screw strips out on some. It's built like a tank and will last a lifetime. It wasn't cheap but I don't regret the purchase one bit. I bought the good one, the real Blackjack 1000. They are actually designed to be used on a lift table, in combination with it. That's very difficult, if not impossible, on a hydraulic jack. You can set them at the exact height you need and easily adjust up or down just a little if need be. They are more compact and more adjustable. As far as floor jacks go, I prefer the screw type over the hydraulic ones. So, if you're not in a hurry, shop for an older used one. We just discussed these in a recent thread and the consensus is the older ones were made better. Yes, you can't beat the HF table lift, with a few mods (grind the sharp corners off).

Blackjack motorcycle jack