It's portability is a big plus, you could slip it in the wifes handbag no problem or any hand luggage you have and it won't take up much space at all.
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If all you are ever going to do in terms of photography is widefield shots (less than say 300mm focal length) then the polarie is probably all you will ever need.
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Greg has hit the nail on the head.
It can take small widefield scopes and a PST as well but if all you ever want to use it for is a dslr then it's perfect. If you want to put anything bigger on it and still remain portable get an astrotrac.
A go to eq would be fine too and as you say you could put your OTA on it but it's not going to slip in the missus' purse as easy.