Godiva makes soem of the best chocolates on the planet, they are known for their quality. Despite their reputation, I wouldn't buy a computer plug in card from them. Lexicon is known for making some of the best outboard effects boxes on the planet. They are known for the quality of their reverbs. Knowing how to design high quality reverb algorithms makes them about as much an expert on computer plug in cards as Godiva.
OK, I'm probably exagerating a litle, but Lexicons expertise is not in PC peripherals. Designing DSP based effects units only barely equips you to understand the computer plug-in card market. They may make a fine product, but I wouldn't assume they do just because they make some of the best effects units.