Amazing desk. Delivery was fast and smooth, assembly took about 4 hour for 2 people with lunch break.
Putting this desk together is not difficult, but it is hard. What I mean by that is that it is a heavy piece of furniture and you really should not try to do it alone. The risk of injury or damaging the desk is too high in my opinion.
Once put together though it is absolutely amazing! Could not recommend it higher.
For the keyboard tray I have tried both the Roland Fantom 7, and the Native Instruments Komplete Kontrol S61. On the speaker stands I have a pair of Adam A7x, and my monitor weighs about 8kg. Both the mentioned keyboards will work fine, and I noticed no stability or balancing issues with the desk. The Fantom is little bit too deep to fit in the tray though so depending on your ergonomic requirements it might get in the way while working in a standing position.
Anyways, 5 stars for sure. Love it!