Are these dual-extruder printers worth the money?

[curious aardvark]

Oh yeah, if the slicer talk above is confusing you - I suggest you do some reading before you buy the printer :-)
https://www.amazon.co.uk/s?k=introdu...f=nb_sb_noss_2

Also start learning how to design your own models.
I recommend openscad - but that's because I can't draw in 2d: http://www.openscad.org/
Lots of tutorial on the net, it's actually much easier to use than it first appears :-)
Also tinkercad is worth looking at - as long as you have decent internet speed. https://www.tinkercad.com/

Also if you use windows 10 (spits) then the 3d builder app will also let you design stuff. I have tried it, didn't like it - but I suspect as it's microsoft I was biased anway.

There are also apps on both apploe (spits again) and android that can both create models and slice and send to the printer (one reason wifi could be useful) haven't tried any myself (can't draw remember), but they're around.

Try and avoid sketchup - it's not great at outputting solid cad models, and for 3d printing: solid cad is what you have to have.

Also there will be qidi facebook groups. I find the facebook 3dprinter groups are full of people either:
1) complaining that it doesn't work all by itself and they have to think and it hurts.
2) who just want to change and 'upgrade' everything - regardless of whether it needs it or not.

But occasionally they can be helpful, lol