Yes, I have a Smiths electronic speedo (GT40 gauge). I did it because it is very simple to calibrate and very accurate. I used a Ford hall-effect sending unit that plugs right in to the Renault transaxle. It all works very well. I did not go with a GPS unit due to the fact it doesn't work in tunnels, can be confused in cities, and isn't accurate on hills. I have a GPS in all my cars for way finding and have noted all these issues over many years of use. GPS is, however, plug and play which could be attractive to some. It's also "reasonably" accurate most of the time.
Nothing wrong with mechanical speedometers. The ones in our cars are now very old and should be serviced before being put into use. I agree that angle drives are better than tightly bent cables. Don't assume a new angle-drive is properly lubed as I have seen a number of new ones fail. Buy from a reputable source and force some heavy oil in there before use.