How satisfied are you? share your thoughts on quality of belt drives

Hi all,
bit of a strange title, but i have to beg your pardon, i am not a native english speaker.

I really need a bigger cnc, but beeing honest i am spoiled by the sheer quality of my tiny one. ( hiwin rails all round, thk precision ballscrews...)

I need the big one mainly in order to cut wood but quite regulary i cut aluminum and 3d jobs for moulds as well.
The latter one just once in a while, but still i would miss the ability to do quality 3d jobs if a replacement would not give satisfying results. Precision is most important on these parts.

I could of course build/buy a standard gantry mill using leadscrews but the thought of the cost effectiveness on a belt system wont let me go...
So i have set out and started on a design for a belt driven cnc... but still i am hesistant about taking the plunge...

There is no need for the machine to take 2kw or bigger spindles or suchlike in fact i would like to reuse my 800 hf spindle - comparable with the kress 1050 to give you an impression how strong it would need to be in the end... no need for overkill.

So within this threat i would like you to share your experience with the belt driven routers.
Like:
-How bad/ good is the belt-stretch over time? - would you recomend using a bigger belt in hindsight. ( i know of the "belt on belt drive / rack and gear" - and will make use of it -but i ask about the original setup specifically.)
-precision/ repeatability of your parts
-would you recomend to use some "gearing" for the steppers, in order to increase torque and precision - or stay direct driven?
-system regitity... do you think an "OX"- like machine is rigrid enough for fast 3d jobs or will it wobble off the table? ( thinking aprox 7000 mm/min in mdf as my buddy uses- in order not to mill for ages on bigger parts)
- anything adittional.
- would you do it again - or use ballscrews in future and why so?

My new design would use linear rails compared to v- or ball races, so no tips needet in that direction.

Thanks for your thoughts

greets from munich, bavaria

Flo