I forgot to tell you that I got my replacement SDS6062 (no V this time, I agreed with the seller as he had this on stock).
This unit worked very good, I had no issues with it. It served me well while repairing a Tektronix 465 scope that I got from ebay. The Tek had some issues at faster sweep speeds and with the help of the guys over at TekScopes Yahoo group and the Owon I could trace the problem to a bad transistor
I think I did the noise measurement when I got it and it checked out ok, it didn't show any extra noise than this price range digital DSOs might have.
And also, for basic measurements it seems OK. At least for a beginner. Overall I'm very happy with the product, I did lots of screenshots and it allowed me to see the main problems of my project so I'm not complaining.
I guess it's a decent tool for the money and I wouldn't expect stellar performance out of it but for most basic stuff it gets the job done with no major issues.
After the problems with the first unit I also decided to get a Tek 465 analog scope for backup and analog feel/work
I could recommend this to beginners as long as they buy it locally from a seller with good warranty support (and stock). It's the same thing with all the other chinese producs - you might get a dud or you might get a better spec (in some areas) than other reputable brands at lower price (larger screen, memory depth etc) but lousy quality. But hey, if it works it's a good deal
This off course applies if you don't have the cash for something better or you want a larger screen with battery option and the ability of differential measurements if you don't have an isolation transformer (can be done with either two channel oscilloscope anyway but I don't know how precise). If you can afford it get an older analog oscilloscope for cheap off ebay (60-100Mhz) and a DSO. Both have their advantages/disadvantages. I can certainly appreciate the on screen measurements of the DSO