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Hi Peter,
The TSA120 is actually a triplet APO not a doublet.
I have had a chance to compare our TSA120 side by side with quite a few scopes at some star parties which had amongst other scopes Skywatchers (one was the Black ED) and Televue and on the same targets there is a difference that you can notice visually.
However you have to remember there is a big difference in price as well so it comes down to if that difference is worth the extra dollars to YOU.
For me personally, when it comes to visual observation then I want the best optical performance combined with best build then I look at the dollars.
For me personally 120mm is the smallest I would go for a APO. If you want quality visuals at a higher diameter reflector design then the Mewlon 250 and 300 is very good.
Hope this helps
Cheers
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