The quality is very good. Objectively, they probably aren't as good as the (generally) recognised leaders - Pioneer/Panasonic, but with Loewe much like B&O you are buying into a design philosophy. The software is very nice, the build quality is lovely. Aftersales is tremendous - largely because they control their dealer channel so well.
Overall, If you have the cash to splash, you won't be disappointed. Basicallly you are sacrificing the last 3% of performance for a very stylish overall package.
One thing to remember about Loewe is that all their screens, including the big ones, are LCD as opposed to Pioneer and Panasonic whose large screens are all of the plasma variety. Having seen their 46" 'individual' set showing 1080p high-def content, I can tell you that it delivers an image that's as sharp as any plasma from Pioneer or Panasonic is capable of, or any LCD I've seen for that matter. Where it loses out are the really deep cinematic blacks that the Kuros of this world can do, but other than that, the Individual range is as top notch as anything... when displaying high-def material. With standard-def though, it doesn't impress to the same extent. From a style point of view, they're pretty cool to look at.
We've never seen a poor Loewe set. Standout features - apart from the style aspect mentioned - are technology (Loewe has been offering TVs with integrated hard drives for years, for example), flexibility (most of its designs are modular - in terms of features as well as accessories like stands etc) and sonics: Loewe TVs tend to sound a cut above, as well as being in the top percentile for picture performance.
Whether all the above is enough to justify the premium they charge over standard sets (some of which, like the Pioneers, have chosen to offer a premium based purely on performance) is up to you - in some instances we've felt it is, others not. But there's no denying you're getting something different.
Incidentally, we'll be testing the latest, tech-packed Loewe (more info here) in our May issue, out April 3rd.