Thought I would share this. I met up with my old guitar teacher this week and he tossed me several Tele parts to play with - vintage done knobs, wiring kit, electrosocket jack and a 60s reissue 3 saddle bridge w\ steel saddles. Obviously didn't wait long to install the bridge and there's certainly some differences with the 3 saddle bridge. First the bridge plate is about half the thickness as the newer MIM\MIA Standard 6 saddle bridges and much lighter. I haven't put it through it's paces but the tone is lighter and airier. With the 6 saddle bridge I was changing my picking technique and went to a thinner pick to get the twang out - with the 3 saddle, the twang is omnipresent. Acoustically there is more top end and less mids with the 3 saddle. And the plate on the 3 saddle is much coarser than the smooth 6 saddle plate - quite a few bumps and ridges.
Here's photos of the axe with the two bridges on. If I had more Tele experience I'd say the 3 saddle sounds more like the Teles I hear on recordings, and the 6 saddle gives a beefier sound.