LOVE LOVE LOVE the name Sloane. I have it on my(very) short list for a girl only.
If you love the name....don't ask anyone what they think. It will be bashed and everyone can come up with something bad that they associate with the name...
I do not think the name reeks of entitled snobbery....and from the looks of it the OP is from California.....so I'm not so sure if the "Sloane Ranger" yuppy association would mean anything to most people from the States.
Yes it may sound masculine but hey- people name their girls Charlie, Grayson, etc and in Britain the name Kristin, Ashley and Lindsay are used for both girls and boys...although here in North America they are mostly seen as girls names...
So I say name your kiddo a name you love.