For a UK service business that runs on enquiries, appointments and follow-up — yes, with the caveat that it needs configuring properly and your team needs training.
The value is real. A trades business paying for a CRM, a booking tool, an SMS service and a page builder is almost certainly spending more than $97 a month for a worse-connected result. The SMS and booking capability is genuinely excellent, and for appointment-driven businesses it is the reason to buy.
The caveats are also real, and most reviews skip them. Support is weak. Releases break things. Email is adequate rather than good. And it arrives configured for a market that is not yours.
The businesses that do well on GoHighLevel are the ones that treated implementation as a project rather than a signup. The ones that struggle bought it, imported a snapshot, and expected it to work.
If email is most of your revenue, or your data cannot leave the UK, buy something else. Those are not edge cases and we say so on the call.