It is a bit chunky compared to the PC but if you are going to detail your car every few weeks/months then I would go for the cheaper one, if you were detailing cars every day then you'd want something more comfortable.
Other than that, it comes with a 3 year warranty, has a variable speed and I've found the results are pretty good.
For a set of 3 pads you are looking at around another £24-£30