I don't like it at all (under the BV7). However, I saw the BL10 underneath a BV4-65 the other day and it looked fine. I don't think it works too well under a small screen. However, the BV4-50 or BV4-65 is a perfect foil for the triangular design.
It's much deeper than I had imagined, too. If you were going to get a BL10 for your BV7, I'd much rather get the 7.4.