I don't no expert on scroll sawing in fact I have done very little of it.
I have that cheap Screwfix one in my shed, I invested in some decent blades and made my own plastic bit where the blade changes (dunno what its called but the original was a poor fit).
It cuts is all I can say and it did what I wanted it too so paid for itself, I would think as in most things you get what you pay for.
Mine has been under the bench for god knows how long now unused but it still works and would cut again if asked too.
There is a larger selection of blades available than I had realised so I got a selection of which nearly all are still in their packets.
