sorry if it has been asked before but i’m looking to get a K40 and can’t find if there is any real (better electronics / board has better features / better PSU ?) difference between the “analog” and “digital” readout versions (i searched and did read up 
) or not.
I’m EU based (don’t want to import from china) and on ebay the analog is 315€ http://www.benl.ebay.be/itm/USB-Laser-Machine-Laser-a-Graver-Engraving-Cutting-Machine-Engrave-40W-CO2-UK-PL/162594923528
and the “digital” is 400€ http://www.benl.ebay.be/itm/40W-USB-CO2-Upgrade-de-gravure-laser-Machine-de-decoupe-gravure-Cutter-gravure/161947562700
…85€ is a rather big difference at that pricepoint.
Don’t really care about led lights or wheels , the water temp is a 2 usd addon…
I get that a digital display value might be a bit more convenient to set the laser power (aldo i like knobs :)…) but is that the only difference?
I’m aware many people add a analog meter to the digital version , that is not what i’m asking.
thank you!