We purchasded the VX 45 4wd robot just after we installed the pool. After owning a couple of pools before and using the vacuum pool cleaners we wanted something better. After using the VX 45 or a couple of months, it seems to work ok. The VX 45 cleans around 95% of the pool, it misses a couple of corners but we expect that. We now broom the corners that we know it misses so we end up with a clean pool. We would buy another one again if we started again.