Hello

I am planing to upgrade my nema 34 stepper system (1090oz-in) and leadshine EM806 drives 60v psu to servo system. Ballscrews are 2020, direct drive at the moment.
I want to get about 20m/minute rapids. It is 1000RPM, and servos are 3000rpm so I am planing to use 3:1 belt reduction.
https://www.cnczone.com/forums/attac...d=440572&stc=1
I want to upgrade because of
1. I have never used servos but always wanted.
2. I like UCCNC but I want to close the loop with linear encoders. To compensate my not so good ballscrews. and I thin I find a way to do it.

Drives I am currently looking (delta brand).
ASD-A2-0421-L (400W)
ASD-A2-0721-L (750W)

The L in the model name indicates fully closed loop drive. the drive has second encoder input for linear scale.
https://www.cnczone.com/forums/attac...d=440574&stc=1

Encoders i want to use
https://www.rls.si/en/rlc2ic-miniatu...gnetic-encoder
Resolution is 0,001mm

My questions:
1. Is delta drives and servos are good quality and reliability.
2. where to buy them is aliexpress okay place? is there are some clones or something in market I have to avoid? (like stepper drivers clone leadshine etc)
3. what power is good for my application? I have 2 motors on Y axis and 1 motor on X axis. (X axis weight is 70kg including Z axis)
4. how complicated is servo tuning, I am read something about it but as i mentioned I am newer used one before.
5. Is anyone used delta servos, if they are good?

Any general information and thought about closed loop, servos, encoders, drivers are welcome.