Having gone through two Oxford oximiser 900’s in 9 years I decided to opt for the optimate 4, with 28% off it seemed a good deal. Having two friends both on their first optimates with many years of biking it seemed the right choice and says a lot about the build quality. It came with a lot of instructions which seemed confusing as it seems you basically just plug it in and let it do its thing. It also has a good length of cable either side of the charger. I only gave it a 4 star because it’s too early to tell but delivery and service from SBS deserves a 5 star.