It's been 3 months and 30 hours having the X590. Twenty one years difference between the 98 345 that I had. Big improvements having the EFI over the carb is great.
Some good things some not bad but different I would say.
For the good EFI can't say enough, tight turn radius, Accel deck great cut and stays clean, power mulch control is one of those goodies you treat yourself to.
Some differences to the 345 would be the deck r and r and the tiller r and r.
The 345 was easier even though the mounting systems are similar.
The deck as mentioned before stays clean with little to no build up.The mulch kit does a great job chopping up the clippings to feed back into the lawn.
The 30" tiller works great and the difference between the two seems to be the X590 spins the tiller faster and the EFI doesn't let the engine bog down.
Overall the upgrade is great I really like this tractor and finding new differences all the time. If I ever upgrade the X595 to a 1025r it would have to have an Accel deck to start.