Glover seems to be exceedingly happy with his - he's been playing Vigier longer than all the other brands he dabbled with combined (Höfner, Fender, Rickenbacker, B.C. Rich, EBMM, Hondo, Peavey, Gibson, Ovation, Steinberg). The Vigier does what it says on the tin ("high end boutique bass"): Provide a hi-fi'sh, if not exactly individualistic clean and assertive tone that is very well heard in a live setting without getting into the way of either Morse's highly processed guitar sounds or Don Airey's keyboard armada. Glover has a set of producer's ears, hence he views the bass sound as something that comes in for the left-overs after all other instruments are happy.
That is not to say that the importance of his sound and playing should be underestimated for DP: When I saw DP a few years ago and Roger had a fresh knee operation, the guy from The Temperance Movement (Nick Fyffe) depped for him and although Nick is a fine player (as you would expect from someone who replaced Stuart Zender within Jamiroquai), DP didn't sound the same that night. Fyffe is a finger player and behind the beat, Roger a pick player (live by sonic necessity he says, not by choice, he prefers to play with his fingers) with what I would call a "relaxed urgency" sense of timing (not frantic). Purple was sputtering on three cylinders at that gig as opposed to firing on all four - the whole performance lacked the typical DP "swingin' drive". It was very interesting to hear for an old fan like me (MK II gigs without Roger are a rare thing) and it really altered my perception of Roger's importance to the DP sound (I knew he was important for all other things relating to the band).