I had one briefly (returned it after deciding I wanted something that did a bit more mapping-wise, but it was a narrow decision since I'd bagged one for a very good discount)
I quizzed customer support about the same issue (plus runtimes), and they confirmed what I'd suspected from some measurements - that the older style bar mount (ie not the 4-point rubber bungee mount) should have room to get the 90 degree usb cable in. Tho' I'd though about cutting away part of the 4-point mount and mounting/screwing it to some sort of intermediate bracket to get the cable in..
(Hmm...pretty sure I'd posted that on the forum at
http://www.brytongps.com/ (the South African distributor's website) - curiously I can see a couple of topics in my profile, but the one I'd posted about runtimes/charge retention seems to have disappeared
I wonder if someone didn't like me posting info I'd had from Bryton support..not that it was anything particularly bad, just a bit more accurate in some situations...)