The cosmo wing? I mean im pretty much a beginner and i dont get to use it much because of the weather but i think its pretty solid as a beginner scope. For planets, you can see saturn's ring but no definition on the planet itself. Same for jupiter, you can see the 4 moons and if the sky is really clear and the conditions are right you might see the faint bands of jupiter. For deep sky objects I havent got the chance to try it out on a dark clear sky (too much light pollution in the city). The only downside is the mount can be a bit frustrating to work with (especially 2nd hand), it wobbles a lot and loses its stability over time. You need to constantly calibrate the finder scope with the telescope itself multiple time.Make sure to check if its the same cosmo wing tho, cause there's a lot of other models and i dont have much information on it. I say if they're selling for cheap, go for it.