I have a Takahashi TSA 120 and I do not regret having it. Quite the opposite. It is a nice size and is not too heavy to use easily. I will say that I use my smaller Tak's more but the view through the TSA120 is quite satisfying. The real issue is the mount. Be sure to get an adequate mount. So many people on CN undermount their telescopes - a terrible mistake.
If I had a Takahashi TSA-120 (at 6.7 kg) I can assure you that I wouldn’t regret it either! I fully agree with you: It is a nice size and is not too heavy to use easily. But once you cross a certain threshold, say a TOA-130NFB (at 12.3 kg) to keep it in the same brand, things start to get fuzzy (not the scope of course!) because you won’t be able to set it up on the same lightweight mount efficiently and then you won’t use it as frequently if you have to set it up each time.
This personal anecdote of mine should make things interesting: When considering buying my 6-inch ED refractor telescope my other, less expensive alternative was, guess what? Yes, a Takahashi TSA-120, a refractor that is possibly as perfect as it can be made in that size -I almost clicked the mouse to order it! But in the end I went for the 6-inch. Years later, mostly because of the heavy mounting requirements and poor local weather, my 6-inch refractor has seen relatively modest use. Had the roles been inverted, I can assure you that the TSA-120 would have been one of my most used scopes and I would not have felt guilty about not using it!
I love your scopes and mounts, thanks for sharing the picture!