Offramps and onramps at Garsfontein Rd (there wasn't any), new offramps and and onramps at Lynnwood Rd (there were none going and coming from north), much better interchange at Rigel (you dont sit there for 20 to 25 min anymore), same at Hans Strydom and R21. The new lights along the R21 are really nice and from Brakfontein north on the N1. Allandale is also a vastly improved interchange better.
The consistent resurfacing of R21 and now having started close to the Old JHB Road on N1 south are not so nice and some of the crap JHB interchanges are still crap (heres looking at you William Nicol)...