I have the f/5 760mm focal length Petzval Bresser AR152S.
While I agree with Tony that a larger scope such as a 12" Dob will outperform everything you list, the 6" Petzval scope does a very respectable job on all the dimmer deep space targets. Pleaides, no. Caroline's Rose, yes. On galaxies, nebula, globulars and distant open clusters (which is most open clusters), the views are quite comparable to 6" APOs. Even double stars will be quite good unless one of the stars is brighter than about magnitude 4.
The short-ish 760mm effective focal length gives amazing wide-field views. Sweeping the summer Milky Way is just plain fun. 3° true FOVs are fairly easy with eyepieces like the AT 28mm UWA or an ES82/30 or 35mm Panoptic, and 3.4° can be reached with some of the widest eyepieces (though you start getting into large, 8mm exit pupils with eyepieces like a 41mm Panoptic).
Keep in mind, though, that the 152mm Petzval is physically the same size as the regular AR152 - the rear Petzval lens just makes it optically shorter. And because it's AR152-sized with a second lens cell in the back, it's heavier than the regular AR152. So it's going to ask a lot of a mount as macdonjh mentioned.