I've tried a few different Bramble Berry FO's, but couldn't get past what I felt was a distinct 'plastic' smell that seemed to underline them, although I've not used them in cp soap (after noticing that), so perhaps they perform better in those?
Someone mentioned Save on Scents - and while I've not purchased from them yet (waiting to win a lottery first - overseas postage is a killer!), I noticed comments on their site talk about diluting them or using in very small %'s, because they're very strong? I do like the look of their humongous range, though, if only they'd open an office in Australia *sigh*.