I have had one for about 3 years. No one had heard of them at that point. However they are hugely popular on the continent.
German co. First time they entered the UK market they launched boilers using cheap innerds which didnt work (only in UK market). 2nd time around they have used award winning technology.
Ours has an external temperature sensor which means the boiler doesnt work hard when its warmer outside. We are very pleased with ours so far and it comes with a 5 year parts and labour guarantee.
Cheaper than WB and Valliant, but I wouldnt be surprised if that once they become more established in the UK if their prices go up.