Is it the actual Maxi Micro Scooter you're looking at? I definitely think they're worth the money. We have a Mini Micro and a Maxi Micro for our 2 and 4 year olds. The 4 year old would be okay on the Mini but it wouldn't last her much longer, but the Maxi should last her at least another few years... until she decides she wants a 2 wheel scooter (if she ever does). I actually read somewhere that they say they're for up to 50kg and that is what the steering is optimised for but they're actually weight tested up to 80kg. With that in mind, I've had a go (or 10) on it and it's great fun! I do think it's worth spending the money on a good scooter. I haven't seen many bigger scooters similar to the Maxi, but I've seen plenty of cheaper alternatives to the Mini Micro and they really don't compare for quality or ease of use.
I haven't looked at prices recently but I found it cheaper to get ours from Germany from this site - https://www.bike-discount.de/en/praesenz/search/q-maxi+micro+scooter It worked out cheaper even with postage and the delivery time was no longer than from a UK company.