I do use a lot of fingering weight yarns, but I mostly use either superwash or tightly spun yarns because I'm mainly using them for socks or mittens which get a lot of wear, or for lace patterns which benefit from the definition of a tightly spun yarn. While the Chroma is very soft and squishy, it's also loosely spun and felts easily (excellent for spit-splicing, not so good for socks or anything else that's going to need frequent washing or get robust wear).
I decided to try holding the two yarns together to get something closer to a worsted weight and allow the colours to complement one another in a marled effect. So far so good...