Yes, I do, I have had a Prusa I3MK2, but really they are way overpriced for what you get. Ok, they do print nice but they are put together with tie wraps. Silly for the price.

I have bought a used Anycubic Kossel and bought the electronics from Duet, so the board and a smart effector, together with a normal E3D v6 hotend. Also (and that was crucial) I bought Haydn's magnetic arms. Best upgrade ever. Put in an aluminium heatbed with anycubic Ultrabase.

It prints very good and much quicker than my Prusa did with no noticable decrease in quality.

Delta printer have a bad rep for being difficult to calibrate, but the Duet hardware does it all automatically. Plus it is proper modern hardware with a color touchscreen and wifi built in and 32 bit all controllable from a PC in a webbrowser, nothing like the 8 bit board with the cheap monochrome display that Prusa still uses.

Do not get me wrong: again, the Prusa is a good printer, but hardly worth the money they are costing. I get better results with my 500 dollar delta and it is doing it in style

Yes, I have actually two delta's (one of them the smaller Anycubic and one XXL of the makers of the Duet hardware) both with the linear option. But in my opinion that does not contribute that much. A well built carriage system is as good as a linear. Linear even makes a little more noise (I also had a SeemeCNC Rostock Max with carriages, worked very good).

Keep in mind that the system should be as rigid as possible, so as little movement as possible that is not wanted. In that regard I love Haydn's magnetic arms for a Delta. They are very strong but also very smooth, so no slack at all in the system. Also keep the belts tensioned. Oh and never use the belt tensioners that clip on to the belts as they make the whole belt a sort of spring, not what you want.

I had the MK2, sold it. And the Duet hardware uses the even more silent trinamic drivers so that the motors make no noise at all. Only thing you hear is the fans. If you change those out with noctua 40mm fans, the printer becomes very silent.

By the way, you can change the motor drivers in an Ender to more silent drivers that also can take more current for about 9 dollar. No soldering.

edit: added some pictures

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Hi, it is the smart effector from Duet3d. That little PCB has for every wire a connector and also it is used as the sensor to do the calibration. It also has leds on the bottom so it lights up the print area.

https://www.duet3d.com/DeltaSmartEffector