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I suspect the Seben Orbinar eyepieces are probably the same as any number of "own-branded" eyepieces you can buy, such as Bintel's Plossl / SuperView / FMC ranges, but generally at a slightly better price at the Seben on-line store.
I have a couple of Seben Orbinar Plossl eyepieces, and they work fine with my (admittedly modest) telescopes. They're definitely better than the equivalent stock Celestron eyepieces that came with my 130 SLT for example. I would highly recommend them for any beginner wanting to get a cheap upgrade to the standard eyepieces of a budget telescope, or wanting to add a bit of choice to their eyepiece selection. (Or you could pay a little more and get a comparable set from a local supplier such as Bintel.)
I have found Seben to be very prompt with their postage, and I have received my deliveries within 7 - 10 days of placing an order. (Bintel are quicker, though, being local, and I have received my orders from them within about 3 days generally.)
I also have Seben's cheap 7.5 - 22.5 zoom eyepiece, which is an absolute bargain at the asking price of less than AU$30, including postage from Germany. The optics are surprisingly good for such a cheap zoom eyepiece, and the build quality is much better than the price would suggest. This is the eyepiece that now "lives" on my telescope 90% of the time. It needs a little bit of re-focus as you change from wide-angle to full zoom, and the FoV narrows down a bit when zoomed out longer than about 15 mm (50 degrees over 7.5 to 15 mm say, then gradually reducing to about 40 degrees at 22.5 mm), but it's really handy as a general workhorse eyepiece.
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