I used to have this bike for a couple of years and did about 40K Km on it. It was a very reliable machine. I only had two issues with it (consider the age). First of them was a broken fuel level probe in the tank and then one of CDI units went (yes, this bike has two CDI units). The reason: the bottom of the seat got lower due to its wear and tear and riders weight and broke the CDI unit connector off. Solution: I made a bracket which went over CDI units and was sitting on the frame held in place by two clamps.
As per screen: I bought a tall MRA screen and it was a great improvement.
Also I made a bigger rear and new side racks. Used soft luggage.
Otherwise the bike stayed stock.
Still thinking whether it was a good idea to sell AT for R100GS.