Hi Fred,
I have the Purion and have ridden a bike with the Intuvia also, realistically the Purion tells you all you need to know. I have a 2018 Cube Cross Hybrid Pro and it's a great quality bike. Nothing has broken on it in the last 700 miles. I used to worry about battery range as I have the 400wh battery, as I've got much fitter and lighter I use the battery less. I used to set the power rating to tour and eco a lot but have come to realise that EMTB setting is best as it sort of gives you the best power to range ratio. If you pedal hard in EMTB it uses less power, it's like an auto setting. My bike has the CX motor and I'd highly recommend that.
I have done a few mods to my bike but nothing radical, I changed my tyres twice and now have Schwalbe Marathon MTB puncture resistant tyres front and back with a 2.1 inch width. I have some more summer tyres which are a bit narrower Schwalbe 365 Marathon +, take a look at my other posts about punctures.