Did them many years ago in India, pseudo ILS.
The controller spoke far more accurately than I could generally fly - "you are 5 feet below glideslope" or "you are 15 feet right of centreline".
A bit like a PRM nowadays, one freq selected to the GCA controller, monitoring the TWR on the other. GCA bloke cleared you to land.
Did one in anger to the minima when an ILS was U/S - worked a treat.
Great stuff, though, and as someone has mentioned, great for your scan rate.
Pity there's not more of it in Oz.