I've ridden it a few times, but it is still being built so often there are vans parked on it, or barriers up. It's not really that different from the shared path that already existed along that side of the road, the main difference is that it passes "behind" the bus stops so you need to be careful for pedestrians crossing to the pavement.
There is still the painted cycle lane on the southbound side, I'm assuming this will stay as there is more than enough room. As far as I can see, the new cycle lane does not link up with anything at the south end, it just stops just north of the Long Rd junction near the bus stop, and there is no real way to use the junction other than as a pedestrian (the pavement is very narrow). I wouldn't use the new cycle lane for travelling southbound.
Lastly, it still doesn't really solve any problems, there is no physical separation between the carriageway and cycle lane, so cars will certainly use it to pass cars waiting to turn right. In fact, the first time I used it an ambulance was travelling north, and without any hesitation or indication, all the traffic pulled into the cycle lane!