I can only say we are very happy with our Aintree widebeam. First stage payment made about 2 weeks before the first lockdown so weeks of wondering if we had lost our money but no. The build took longer than originally envisioned due to 2nd and 3rd lockdowns adding to the general shortage of parts, including the engine.
When we were sent the invoice for the engine I returned it and asked for it to be amended to add the engine serial number. That way I could speak periodically with Beta to check progress.
As for follow up after launch then yes, we've had some problems but they were all sorted and even now 3 years later I can email or text their trouble shooter and get an answer.
I'm not an Everton fan but it might help if you are!