I had a Bifrost DAC way back when and
- it was well built (robust with good component layout)
- modular design that allowed for upgrades (which attracted me)
- looked clean and minimalist - if you like that look
- had the right features for me at that time
- responded well to good cables
- they sounded pretty good at first, but then the competition caught up and surpassed
They have upgraded their products, but I think many of their products are now regarded as "middle of the road" from a performance perspective.
There are better performing products out there, but there are also many that do not compete with them
Regards - Steve