I have been co-owning a Takahashi Sky90 with an observing buddy. It's more like an impulse purchase, since another observing buddy decided to sell his Sky90 quick, and since I had been dreaming about a good refractor for long, I took the chance!
In these few years, I didn't really use it much. I have been trying to use it for visual observation, for side walk astronomy, for solar/lunar imaging, and even planets. Experienced amateurs will immediately have a big question in mind....
Yes, isn't the Sky90 more for deep sky imaging?
You're right. I didn't fully use it, and that's what I mean. For the above purpose, maybe my C5 will do even better in terms of portability and also aperture. I even briefly owned a Extender Q in order to explore the high power usage of the Sky90, but it was not impressive after all. For deep sky imaging, I guess that I lacked a good mount, but I don't think that I will buy one any time soon. I would prefer the simplicity of camera lens, as well as for the portability.
I know my observing buddy will use it for better than me, as he did in the past few years.