The first one was sold but I soon wanted to get another one.
The second one was a lemon and I soon returned it.
The third one has arrived for a few weeks maybe, but I just managed to get some star lights to fall on it. I colliminated briefly and stars were pinpoint.
Cloud moved in and out so that I cannot really fine tune the collimation, or I can really observe with it. But at least I know it's not a lemon. The last one could not form any decent image even for day light target.
Wish that I can have time to really try it out, it shall stay with me for a pretty long time.