@SB310 - I too have quite a few open-top bags, and have never had any issues with theft <frantically touches wood>, but I heard this piece on the radio about staying safe during the Olympics (or in any other large crowds), and it has made me completely paranoid. Similar to this (but read/watch at your peril!)...
http://www.bbc.co.uk/news/uk-18798792
I think that my friend's La Trop bag has taken on a richer shade through use. I saw it the day it arrived in the mail at the beginning of this year, and have seen it regularly since then, as my friend uses it every single day (she's in love!) I asked her recently if she'd treated it with leather feed, because it looks really burnished and amazing, but she said that she's done absolutely nothing to it. I'm convinced that it has not only darkened, losing some of it's redness and becoming more chestnut-coloured, but also it seems to be changing in texture slightly, and becoming less stiff and more pliable. The stitching, which is white, has also darkened, which I think improves the overall look.
Anyway, I think your black version looks amazing on you, and you should keep it. It will be nicely aged when you eventually cave and buy the brown one as well!
- Lips