So, I got this Sod Buster JR today. I'm not sure how to judge these things, but it did arrive reasonably sharp. The edge was pretty gritty as expected, but a few strokes on ceramic smoothed it out completely. There's a minor gap behind one of the scales, and the back spring does sit up ever so slightly when opened. The opening/closing was a bit gritty but I put some oil inside it and worked it around a bit, and it seems fine now. Blade centering is pretty good. It seems fair for the price.
As for the size, whether or not I'd be comfortable carrying a slipjoint, that I don't know yet. As for the size, it's a fairly small knife in the hand. For most my EDC tasks, I could get by with even smaller. This is definitely more pocketable than my Rat 1 though. It's a good in-between size.
As for being a slipjoint, that will take more time to figure out. As I said above, the action was kind of gritty, so I'm thinking opening/closing will get easier as that wears in. It was pretty tough to open initially which was a negative, but it's already smoothing out nicely. So, we'll see.