I bought this exact set, with the same pouch, for my son's mother in 1996. She is still using it, and it's still going strong. Mechanically, the only difference with the current model is the feed: the older fountain pen has a feed with exposed fins. To me it's preferable, as it's easier to clean.
It's a very good price. You should have no problem with either pen. BP refills are readily available at JetPens and other places, or from wide range of sellers on German ebay. If the fountain pen is clogged or skipping, I would take it apart to give it a good clean. It's very easy: use a tissue or thin cloth, grasp the nib and feed, and gently and slowly twist and pull. They will come out. Give the nib and feed and empty section a good soak in some soapy water (or dilute ammonia), and you can give the feed a scrub with a soft old toothbrush in the soapy water. Try to make sure there is no dried ink sitting in the slit of the nib: this all depends on how clean the pen is inside. Rinse well, and reassmble. Push gently until you feel a small click.
If it still writes skippy, try this: you will notice on the top of the feed there is a little ridge where the nib is supposed to sit when you put everything back together. Put the nib back on the feed a little forward of this ridge, maybe 1mm, and then re-assemble. Just make sure the feed and nib are properly aligned. I find this increases the flow a little, for what it's worth.
The Sport is one of my favourite pens, cheap, portable, quality nib, writes well and easy to maintain. Definitely punches above its weight.
[Edit] There's tons of posts here on Kaweco Sports, hours of entertainment on converting the FP to an eyedropper, etc.
Enjoy the pens, you got a good deal!
Edited by wastelanded, 31 August 2012 - 18:44.