Their conclusion was that Google had the best overall results across multiple query types (general search, image search, video search etc), but:
two other services topped it–barely–in our text-search tests.
These results don’t differ all that much from what we found in testing the various search options at AOL when I was there a couple of years ago. When stripped of UI and branding, most users couldn’t tell the difference in quality between search results. When UI and branding was returned, most people thought that Google was the best search engine.
This speaks to the power of branding in the third phase of competition of consumer internet companies, as I have blogged about in the past. First comes distribution, then product and finally branding. It explains why, even though Google’s general web search isn’t head and shoulders better than the other search engines any more, it continues to win market share.