Associate
Perhaps it's down to an element of luck as well...? On our second year of needing a service the engineer noted some issues with the boiler. They were passed on to Baxi and the engineer visited within a day or two, the boiler still providing hot water at that point. Parts were changed promptly and all went well and has continued to do so.
I remember looking at the rated reviews over at TP, if you value that site, and Baxi, compared, as an example, to Ideal, seemed a decent enough choice.
The cost of the boiler tho........(still, I thought of it as "better" value than a GPU)
Definitely better value than a GPU but not as much fun! Also I tend to take online boiler reviews with a pinch of salt as people only usually review them when they go wrong.