Seems to be the international version of the site svb.de, probably the largest boating bits supplier in Germany.
They are on the cost-efficient side, but I have found many bits to be cheaper in the UK when outfitting my boat (especially niche suppliers such as gaelforce marine or jgtech).
Service has been good, they sourced some 13mm nut to get my weirdo ISO chain on their cheap Italian windlass, they deliver on time, every time, well, it's a German company, what do you expect
I know several people who have used them. I am about to, as the shipping costs are attractive (up to 31kgs for 6.5 euros), and the items I have priced are the same or a little less than UK suppliers.
Also got a free catalogue from them although its in German, but as there are pics. of almost everything it really does not matter. The website has an English option.