Any question answered...

look like it'll interfere with the gear cable

I've got one of those. As already mentioned, it fouls the cables on the downtube. In addition the ratchet mechanism doesn't let you clamp the bike tightly enough and the BB support erm... doesn't. Would not recommend.

Having used the stand on quite a few bikes, I've never had a gear cable issue. The clamp and bottom bracket mount have plenty of clearance for cables, as can be seen in the picture.

I do recommend and do use it.