i love my S1, and as you can see from peoples signatures on here there is a lot of S1/S3 users. Battery lasts 2x 18holes quite easy on my 27 hole battery. Folds up small as well which is good cause i have only got a 2 seater car!
The new improved S3 has some other great features like Distance control, etc.
Good customer service from UK company. I will only change my S1 for an S3. Highly recommended.