[Batian]

I have, and have only ever used a pre millennium Professional, so my thoughts carry that caveat.

When at your stage, my research made me realise (and confirmed by others) that the models are all basically the same in function and main components but some have more glitter, whistles and bells!

The Pro ( as does the other more glamorous models) has a larger water capacity than the Europiccola. Both models work best at the upper range of the tank capacity so the smaller tank shows its limitations earlier, whilst still being capable.

The post millennium has a slightly wider porta filter and basket and therefore also requires a different size tamper.

The big deal is the the models with a pressure gauge are easier to work with. You do not have to listen for the steam release valve opening to know its up to heat and pressure.

I think you probably get more bang for your buck if you buy a pre millennium model that is in overall good condition, leaving some £s in the budget to give it a thorough service. Check here for a guide on service part prices.

I am no engineer wizard, but I have managed it twice with guidance from existing threads on the forum and help from @jimbojohn55 @coffeechap @El carajillo to name a few!

What is good condition.?

I would take particular care on checking the base inside and out----rust here can be major surgery. Check also that the boiler is firm to the base and does not rotate. Again, major surgery. Use a penlight to look into the boiler for limescale. Moderate scale can easily be removed along with a full service, but its absence may indicate how much care its previous users have given!

I am sure others will chip in with more details, have fun with your search.