I am just getting to the point where I feel my knitting skills are good enough that I can start using some REAL fibers. My only experience with what I would classify as real fiber (I don't count anything I can buy at A.C. Moore) is a few skeins of Debbie Bliss Cashmerino. I've looked up reviews of different brands on Ravelry, but all have positives and negatives.
Soo.. what's your favorite?
Well, it depends.
Personally, I don't like Debbie Bliss Cashmerino be it aran or dk. It was the first designer yarn that I had ever knit with (fetching), and the yarn pilled and looked quite shabby by the time I'd finished the gloves. I'll give it this: it feels like buttah, and that it's warm and squishy against my palms, but I'd never
make an entire garment out of it. I think the Debbie Bliss rialto (dk) is the best yarn she's done so far. I rather liked the Cathay (DB) as well.
I do like merino wools, preferably superwash. I'm currently crushing on Lana Grossa cool wool merino big superfine. It's springy and a pleasure to knit with, so far the pilling is minimal, and a decent yardage -120 meters for 50 g. Lana Grossa Elastico (cotton with a stretch) yarn is nice as well.
For rowan yarns: I like their wool/cotton, love the Calmer yarn which is a stretchable cotton yarn (frightfully expensive). I also like Rowan's Cocoon yarn. So soft and squishy.
I've heard good things about Malabrigo but I shan't look at that until next year!