Personally, I don't mind if muslim women, or any women, choose to wear the burka. However, if they are asked to identify themselves by a police officer or customs official then they should do it (although this should be in private if they so wish it). That way, they respect a legal requirement in this country and we respect their wishes to wear what they want as part of their culture.
One thing I have noticed with women wearing the burka is that you tend to notice their eyes, which always seem to look beautiful. The rest must be left to your imagination!