I agree some coloration might be introduced. Not certain, though. Rupert's coloration is not necessarily a bad thing. Nearly anything in the signal has the potential to have some audible evidence.
Nearly every piece of Neve gear I have used over the years have been nicer sounding to me due to transformer choices in manufacturer. The right "iron" can make a world of difference in tube amps, in my experience.
I think this one is worth a hard look if DI head profiles are a major part of one's methodology for profiling. As it's a Neve branded product, I think it will be reviewed by may publications.