So, in short..Respectable. Very respectable.
Not an expert here and 65 year old eyes, but going through my Celestron 8SE for one night, only using them. It worked,and worked pretty well.
Let's start with the alignment. I went with a very simple planetary alignment (Venus), starting from 21mm, them centering on 7mm. Worked well all night and found just about every target there was (at least in the western sky) Comparing to my supplied Celestron 25MM and purchased 9mm X-Cel LX, it held its weight, I hardly noticed much of a difference. I italicized this for the simple reason my eyes just aren't as sharp as they used to be. There may be a little difference, but hardly a game changer.
With a 2x barlow--which I used on another night, not bad at all either, but did over-power the telescope. Jupiter was not so resolved at 580x, but it did still resolve the two bands.
The only item I wish it had was a clicking as I turn form one magnification to another, but certainly there are some that likely have that feature.
For dark sky viewing I would not recommend, but for planetary and even some easy to spot deep sky objects such as the Orion Nebula, not bad at all. For double stars---its amazing. I even got both the double clusters in one field of view, but barely.
In summary, for a quick nights view and perhaps when its a bit colder out there, this is a likeable remedy vs the cluttering around from one eyepiece to another.