I have two sets of Ent-Gravels. I bought the first set for my
Ribble CGR to replace the lumps of iron Mavic Aksiums it came with. Was so impressed after a month or so riding them that I ordered another so I could have a set with GP5000AS TRs for winter road use and a set with gravel tyres so easy to switch between the two.
The model I have is not the lightest - about 1600g for 45mm depth, but a 24mm internal width which was important for my usage. The finish of the rims is superb - look way more premium than a set of Primes I have. You need to fit tubeless tape yourself but they supply some pretty decent stuff in the box, and they don't come with valves or spare spokes (but use pretty standard Pillar spokes).
You don't need to pay tax per se - you need to select the DPD shipping which covers the taxes. Make sure you order at the beginning of the month or during a sale when they have their discount codes available, I was able to use a £30 voucher both times so came in about the £270 mark each. Genuinely can't think of a single mainstream brand you could get for £550 that I'd rather use than them, and I have two sets for the price...