I have had a keyless and Lejeune Pratten in blackwood for about 1 1/2 year and recently got a six keyed body from Geert (and sent him back the keyless one).
First of all, Geert is a really fine business man. When I ordered the keyless flute, I got it exactly within the 1 month time span Geert announced - the same for the the keyed body. He mentioned a 18 month waiting period and I got it exactly after 18 months. And ever time I had a question, he mailed me back quickly.
Compared to other flutes I put my hands on ore owned, this flute does take a bit more air and relatively focused embrouchure. I love it for its strong tone, loudness and the "reedyness" I can give it. In fact, I think I since owning the flute, I haven't gotten my hands on a flute that can be pushed as much as my Pratten Lejeune flute- and that I would trade for it! Especially the low d can be really lent into, at least if you find the sweet spot with your embrochure. For me it took some time find this spot, it is not the easiest flute to play.
I want to emphasise that the sound can be soft and woody if you like, but the flute can certainly be driven to an extreme loudness and projection
In smaller circles of musicians I sometimes have to make sure that I don't play too loud. Obviously, this can make playing the flute physically more challenging, at least if you want to "max out" in terms of loudness.
If often feel like I can come a lot closer the sound colours of Louise Mulcahy, Callum Stewart or Matt Molloy with this flute, than to the ones of Kevin Crawford or Grey Larson. But that might be just my bias, because I prefer the sound of the former three ones.
Multiple really good flute players and two professional ones (one being a former Ireland champion, another one playing an Orwell) stated that unkeyed one is a really good flute, after trying it out. Since then, because of Corona, only one flute player was able to try out the new keyed body and liked it a lot. And I think it is even better than my old unkeyed one..but that might be my bias
The only downsides I can mention is that two keys pads fell probably off, but that was fixed by myself within a couple of minutes. And the barrel developed a small crack shortly after I got the flute (bad time for playing in a new flute, it was during January or February). But his barrels are fully lined, therefore it is only cosmetical - and I am probably the only person who has ever noticed it.
I haven't played his newer standard or Rudall models, but the Pratten one certainly is really good and strong, but of physically a bit more challenging than most other flutes I played.
Do you plan on getting a keyed or unkeyed one? My fully lined headjoint + the fully lined barrel made the keyless flute notably top heavy. The keyed body is of course quite a bit heavier than the unkeyed on - but it feels much lighter when playing, because of the increased balance.