Personally I won't touch tyres that are made by Chinese manufacturers, or are designed for climates very different to our own - on the former I've seen far too many tyres in a professional capacity that fail to pass the testing that should be carried out for them to have a valid e-mark, or where they fail spectacularly not far above that minimum level. The quality of construction is usually shoddy unless there's a European manufacturer's quality control process in place to monitor the repeatability of construction.
Tyres designed for hot climates have a different mix of materials designed to still give long life when used on worn smooth roads. They generally offer inferior grip/wear rate on European roads with much more variable temperatures. Whether they make economic sense depends on how long they last and if you are happy to drive within their lower limits.
I've made a set of Michelin's on our A6 last over 16k miles and counting, at a cost of £450 for 4. I've opted for Continentals as the replacements when they are due as they're a little cheaper than Michelin at the moment and we had good results with them on our old Passat.
Christ knows what I'll do when the 20" Michelins wear out on the S8 - probably sell the car 
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===SOLD===2002 Audi S8 D2 Final Edition (yes, really) in Avus Silver with purple extended leather===SOLD===
2011 S5 Sportback in Phantom Black with black Super Sports leather, 9x20s, tech pack high, adaptive xenon plus, intelligent key, memory seats pack, sunroof, B&O, Audi Drive Select & quattro Sports Diff, DAB, parking system plus
2015 VW Golf GTI Performance Pack in Carbon Grey with black Vienna leather, tech pack (Discovery Pro nav & Dynaudio), DCC, factory towbar and retrofit RVC
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