Its always worth trying. I would have one too but I do think they a far too over priced for how much they cost to produce and still stick by my point that you are better off with a pro audio dac if your going to fork out for one.
I recently did a comparison with my Macbook Pro VS my AVI Labs Series CDP with my Xcan V3 and HD650 (I use these for all reference as you can not argue with the quality!) and the difference was negligible. Considering I paid £1600 for my CDP a few years back believe me I wanted to hear a difference. All I noticed was the output on the CDP was higher which did give the initial impression of more punch, better clarity, tighter bass but when I adjusted levels the difference went and I could not tell which was which.
For me if my Macbook sounds as good as my CDP then I find no reason to try and make it better. I might take a loan of my friends pro audio dac and see what happens out of interest.
At the end of it though there is no right or wrong. It is about what YOU are happy with. If you can hear a difference (and by that I mean an improvement rather than difference!) and you can do so blind then go for it