I had a TEC180FL for several years and it was my primary high end scope.
I did not use it visually very much but I did view through a few times. Orion was very detailed and overall the views were great but I think not as good as I recall with a Tak FS152 I had with a 22mm type 4 Nagler.
I used the TEC180 mainly for imaging and it was quite good for that. Although I found images from a friend's Tal TOA150 often showed more detail, sharper and more of the subtle things in an image. I also saw a test report of the TE180 and it seemed weak in the red channel. I'd describe it as a very good imaging scope but it could be improved. It seemed it was more optimised for visual.
I did have scare once with the TEC180. One night when it was coldish (2C or so) the lens oil developed spiders veins. They went away when it warmed up and I never saw them again (several years). It was soon after I received it and I think it must have been from the air travel.
I have since had an AP140, Tak FSQ106EDX3 and a CFF105 F6. The CFF is one of the more impressive scopes I have owned. I prefer it over a TEC110 FL I had which was quite a nice scope.
So for imaging I would rate a TOA150 as slightly superior.
The TEC180 is fairly large and heavy and I would describe it as about the maximum I would want to have to handle to mount and dismount. I could do it but I was very careful as its a very expensive scope.