Chipsaway are a franchise, and as such the quality of the work is very dependent on the skill of the technician that works on your car. Granted they no-doubt all have to undergo training and certification by Chipsaway to learn the ‘proprietary process’ but the quality of work can vary based on experience. I used them twice in the past on my old car. Once was fantastic (like
@Adam14 ’s experience), the second time (with a different technician) less so, and afterwards I always wished I’d just taken it to a decent local body shop for a proper re-spray of the offending panel.
They’ll do you a free quote if you post a picture and some details on their website, so might be worth seeing what they have to say/how much they quote, but a smart repair can be tricky on a large panel like a bonnet, as would involve blending the area repainted with the rest of the panel. Not easy to do well - especially with metallic/pearl finishes and you might be left noticing the repair. Get a quote off them, and compare it to the cost of a full bonnet respray, and go from there.
Or, accept that your bonnet is a high risk panel for stone chips and it will likely happen again, and therefore a good quality touch-up kit as referenced by
@Scotty75 or myself could be a cheap and effective (enough) solution for now, and for when (probably not if) it happens again. Then in a year or two, if your bonnet looks like it’s been following a gritter lorry down the motorway at close range for 20 miles, perhaps consider the full respray option then.
Do let us know what you decide to do mate, and please share the end results. Sorry you’ve experienced this - so frustrating when you look after your motor so diligently.