My AP was my first dielectric, though the TV aluminised are not at all disappointing. I just wanted an AP product, and a near-mint pre-owned reduced enough came along. Likewise, later, a TV Everbrite. To be honest, there is very little difference, if any, between the 3 models for what I look at, and the magnifications used. I also have a SW dielectric as an OE kit piece, and visually, nothing much different either.
Strength of construction and rigidity, where the AP & TV excel, is important for the big heavy eyepieces I use. There its focuser strength that is most important, perhaps another "obvious" that is overlooked too often.
My 2 correct image prisms were chosen and bought intentionally. Both APM roof and the Baader Amici astro model are excellent. I bought the APM in their re-location sale, and the Baader just in time before Brexit kicked the £:€ rate in its teeth again. Both these prisms give bright beautiful views, no vignetting. I have used each in a F5 refractor and had no noticable issues. APM wins on value for money, Baader for perfectionists.
Why skimp on quality when it could compromise your telescope and eyepiece investments?
Edited by 25585, 20 June 2019 - 08:11 AM.