Is STRV 81 worth the bonds?

I have 4 t8 premium tanks(Löwe, Liberte, Patriot and Strv S1). I bought s1 recently because i wanted variety(playing heavies becomes boring quickly). And now hopefully ill have enough bonds to purchase another t8 premium from the bond shop.

Lights in the bond shop are trash in my opinion. And im thinking of buying elc even with golds because it seems cheap for what it is. Ill have enough golds soon(im getting 250 every day) and ask for your opinion in a seperate post.

T-103 is the only td in the bond shop and seems like a boring tank to play. I have s1 and im not thinking of buying any premium td.

I already have 2 of the best heavies in the bonds shop, i dont need another one. Maybe ill consider crysler in the future.

So im thinking of spending my bonds for a med. and strv 81 seems like the best one in paper. decent pen, decent power/weight ratio, decent turret armor etc. but the fact that it has low alpha and poor concealment makes me have second thoughts. what do you think? should i buy it? should i consider another vehicle? should i wait for an update in the bonds shop? or should i keep saving my bonds for m60 or 121b?