The furigana is sometimes wrong. (Examples: It puts 「ま」 over 「間」 in the phrase 「の間に」, instead of 「あいだ」; in the phrase 「とは限らない」, the furigana reads 「かぎら」 when it should be just 「かぎ」). Aside from that, no complaints so far.

(It would also be nice if the text could be read by Rikaichamp, but that's just a niche feature request. For all I know maybe it's not possible to have that kind of text in a new tab page.)