[Tickle]

After having to help two friends with their S1's while owning an S2 at the same time ~ I can honestly say that the S2 has less hassle.

Here are some reasons why:
Battery location of the S2 was more secure and wasn't in an area that could get wet if the side window leaked.
The heating system was upgraded in the S2's (still laughible, just less so)
The front nose of the S2 greatly decreased nose lift above 70 mph
The really crappy one piece PCB dash of the S1's (which left the factory non-functioning) was replaced with nice Smith gauges in the S2's
Electric window guides where properly mounting in the S2's. The S1 windows would often get stuck in either the up or down positions
The rover tail lamps of the S1's were prone to leak.
The S2 wiring harness (the one and only - it seemed) was significantly better routed and less confusing.
The S2 had twin head light bucket motors versus the single motor in the S1. So when one motor went wacky in the rain, at least you would have one headlight on in the S2. In the S1 you would loose both headlights.
The S2 seats were more comfortible with less foam ~ taller drivers could more easily fit in an S2.
The S2 has MUCH better access to the motor thru the bottom motor pan.

Overall, the S2 was a much less of a hassle to live with than the S2's.