Hello Tom,
surely many German manufacturers cannot compete with the price-performance ratio in Poland. So, if you don’t mind the long transport or if the garden and doors don’t become expensive again due to delivery times or delivery fees, it is definitely a good choice.
With flush-fitting doors, there are two things to consider: the installation is more complex because every millimeter is visible later, so these doors also need to be regularly adjusted. Due to the flush door, soundproofing is also somewhat more difficult to ensure in the long term.
Perfectly installed and regularly maintained, you then have a real eye-catcher thanks to the continuous shadow gap.
Best regards and have fun with the doors and frames.