I painted the Chieftains up, and fitted them with magnets for flexible basing (more of that in another post). They seem nice enough models, certainly with better definition than previous H&R I have bought - though that does go back to about 2000. I thought I should do a proper comparison, so I sent off for a pack of five GHQ Chieftains - these are the Mark 5. I painted these up as well, and the photos below show both types together. It is easy enough to spot the H&R models, they have distinctly fatter gun barrels.
Overall, I still prefer the GHQ. Apart from the finer barrels, they generally have sharper detailing. They are also slightly larger - about 2mm longer and maybe 0.5mm wider - though the GHQ ones actually seem slightly lower in profile. There is more definition in the various racks, grilles and other attachments to the hull and turret. Not a huge difference - the H&R one is not a bad model, but GHQ wins for me.
Of course there is one major downside - the GHQ tanks cost £9-25 for the pack of five, or £1-85 each. The H&R ones cost 65p each, only a whisker over a third the price - and as I mentioned you can buy exactly what you need, which may effectively lower the price quite a bit - if you wanted six, say.
So if price or purchasing flexibility are important, H&R are well ahead here. But if you want the best quality models, it's still GHQ. I would also say that H&R still has no photos on the site, which makes purchasing a bit of a shot in the dark. I got my GHQ from Wargames Emporium - Magister Militum are the other UK stockist - and on both their sites you can see a picture of every model before you buy. That matters to me, especially with infantry where you would like to see the poses and animation.