This guy compares the Bonus IE to the BLONs.
I have them both and I don't think the Bonus IE is in any way competitive with the BL-03. BIE has a bloated bass and is generally unrefined in comparison.
Edit: Discussion of BIE in video is toward the end.
I compared the Blon to the VE bonus IE as it is only a £3 price gap but I agree the Blon is much better.
Thanks for your impressions. I didn't get the VE bonus IE after finding out it didn't have detachable cables but your impressions reinforced not to get them (based on sound).