That one from Northern is OK, but I still wouldn't buy it.
This is what I would be looking for if I were to build (yet another) engine stand today:
One piece frame construction. (Does anyone EVER fold them down for storage?)
Stay away from any 3 wheeler where the bottom frame is a "T" design. use an "I" design and 4 wheels or something like the Northern one shown. If you want to have a multi part bottom frame make it so you can widen the stance of the wheels. I don't care for the bracing straps on that Northern stand, they are at too shallow of an angle to have much effect. Put in welded braces that actually do something...
Use bigger wheels and use hard rubber of plastic coated wheels, the 2" steel wheels are **** and an accident waiting to happen. 4" at least, all casters, and all with locks.
The screw down legs aren't a bad idea, but why are they so far inboard? Put them outside the wheels if you use them.
Get a gear reducer box and a hand crank for it. Mount it so it can be swung up in a hinge to engage a bolt head on the center of engine plate cylinder, and lock in place, gear it low enough so it can hold the engine sideways by itself. Make sure you have lock positioning pins for several angles besides straight up or straight down (No I don't like set screws...). This may require several sets of holes in the holding sleeve and in the engine plate cylinder.
If you have an engine on the stand for long periods of time, make a front crank pulley support that can take the strain off the bell housing bolts. You aren't doing the block any long term good hanging from only the back. You can use a light 1-1/2 ton hydraulic jack mounted to a U channel that fits the center frame member if you use an "I' frame design, and make up a cradle and socket for the screw post.
Make the support plate so you can use up to 6 arms instead of 4. Yes you have to think about the geometry a bit before you cut and drill it, but it provides a LOT more support.
Make it so the engine sets level or near level (What purpose is served for that Northern stand to be up at such an exaggerated angle?). and think about the best height for most of your work. If its heads off, you might want it a bit higher.