Agree on the Classic Pro.

The Gaggiuno is quite complex; a Shades of Coffee PID kit is simpler if you want better shot-to-shot consistency and don't care much about customizing to the nth degree.

Single boiler is fine if you're making coffee for one or two - any more than that and the overhead of switching boiler temperatures makes the process painful.

I've had mine for about 3 years, routine descale with solution about a year ago, no issues. My water is around 120ppm.

Prone to scale easily though, I sold mine and planning on getting a manual lever machine as mentioned in another top comment.