Take my reply with a grain of salt because except for a very cheap and effectively unusable 4" Newt, the only telescope I've owned is my current SW Esprit 100ED. It's an apochromatic triplet which comes with a 2 element field flattener. It is a 550mm focal length, 100mm aperture f/5.5 and I couldn't recommend it more highly. I've read reviews where it is compared to a Tak FSQ 106 (
https://www.cloudynights.com/topic/4...sw-esprit-100/) and it isn't too far behind (for much less cost).
Kevin