^^^ To be honest my reply was tongue in cheek.
I was hoping to see what durhamplumber considered "premium".
After looking in on numerous posts over quite a while we all know that the ill informed enquirer looking for advice WILL be told that :-
WB are crap - for a variety of reasons (but their back up is good). They only sell coz of their advertising and the Which magazine
Vaillant is crap for a variety of reasons and Glowworm is even more crap, but cheaper crap and they, too, sell well coz of Which magazine.
Baxi is crap
Ideal is especially crap (and leaks more than the rest)
Potterton don't even get a look in
Viessman is over-rated, expensive crap, the degree of which depends who's commenting, and is less often seen in peoples houses and therefore to be avoided like the plague.
Vokera is highly rated by one or two respected regulars here here but the majority of commentators would write it off ..... as crap.
Intergas. We've covered that in some detail. The gear isn't crap, but the company, which used to be good, is crap now.
Have I missed anything?
Before I get abused, you've got to admit that the whole world (but plumbing and heating forums especially) has diametrically opposed views on what's good and what isn't and whatever you finish up with 50% of the panel will think you're mad.