As a longtime Roon user, I recently revisited purchasing a Nucleus. After some reading, I found the Nucleus One perfectly matched my needs for a single-zone setup with a limited library, mild DSP, and sample rate conversion. I just purchased one and wanted to share my very positive experience. The ordering process was smooth, and it was delivered to central Canada from California in under 48 hours. Implementation was truly pain-free: installing an internal SSD, transferring my library, and migrating the database and current license from my previous Windows core took minimal effort. I shouldnt have slept so long on this. To anyone else on the fence, I highly recommend acting on it.
My experience - almost two years ago now - was similar to yours. A good purchase!