I just got my Rubin Pocket Uke a few days ago. I purchased it on May 2 and it arrived on May 15, so pretty quick from China (with no shipping cost!). They packaged the uke well in a small triangle box that was surrounded by styrofoam. After a few days with it I'd say that I'm happy with the purchase. Here are some initial thoughts after strumming it for while.
First off, it's tiny! I knew it would be, but it really sunk in when I picked it up and starting playing it. I took a picture of it next to my Tenor Kala for a bit of scale.
I have to say that this uke looks almost identical to the pictures shown on eBay, which I find very attractive. I was slightly worried I'd open the box to see an approximated toy version inside. Luckily it's a real ukulele (or real enough to justify the $40). A few quick thoughts on the construction. There is a light gloss finish on all wood parts (laminate), and I'm pretty sure the Aquila strings are actually Aquila (which I suppose is good or bad depending on if you like em, it seems some people on the board aren't the biggest fan of Aquila). The saddle and nut are predictably plastic. The saddle is a bit high, making the action just a touch high as well. Other than trying to fit all of my fingers into a scrunched chord the neck actually feels pretty good. The frets are smooth on the sides of the neck, and the neck is straight. The tuners seem decent as I haven't had any serious slipping issues (I've had to tune it quite a bit, but I attribute that to new Aquila strings and the size of it, I feel I'll be tuning it a couple times every time I play it).
As for the sound...it's actually pretty good! It's obviously a little thin what with the higher tuning and extremely small body, but it's got a nice tone to it.
My biggest issue with the uke is the intonation. When playing a combination of open notes and fretted notes past say, the fifth or so fret, the issue becomes apparent. But, eh, forty bucks. Hopefully the company is able to ethically treat the builders.
So there's my quick two cents on the whole "Rubin" ukulele situation. For $40 you can certainly a get much, much worse product. I'm glad I bought a cheap pocket uke and not the Kala, because while I think I'm going to have a lot of fun with this little guy, I wouldn't be able to justify spending $175 for something that I feel is at least kind of gimmicky. I'm still interested in playing one of their aco/electric solid tops to see if they are worth the money. If I get some time I'll do a quick recording to give everyone an idea of what's up, and hopefully throw up a couple more pictures with different angles. Cheers I hope this wasn't too talky and helps anyone interested in this mysterious company!