I think by “chipping” we may be talking about the TMC or Bluespark boxes. There are several reviews on the mods pages. From memory of some of the posts, both companies are happy to take calls and offer advice. People seemed to be reporting higher bhp, better low end delivery of the power and were reporting better mpg, so could well be worth it.
There are some that prefer a remap, but as Neil states, would have to be reported to your insurance as it is permanently fitted to the car where the box clips in and out so can be argued is not permanent. There is also the risk of voided warranty with re map and if the dealer updates the engine map at service, you would lose your tailored mapping.
Let us know what you choose and how you get on.
Andy