Vulpine often suffers from over fussy detailing, and I have had to return a much higher percentage of garments due to stitching failing than with Rapha. I am not such a fan of their choice of colours - though Rapha do have a track record of some pretty poor colour choices, they tend not to be across the whole range.
I frequently find their stuff to be close, but no cigar. Odd cut, strange fit, or weird details that don't really help. The magnetic closure on a trouser pocket did not work as the pocket flap developed a crease and it meant the flap did not line up correctly for the magnets to work.
It feels they are the poor cousin of Rapha, trying a little too hard to both emulate but set themselves apart. They are a brand that I'd like to like more but given their near Rapha prices I know which I am more likely to buy.