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Almost every device from Samsung I've owned lost support as soon as a newer device/os came along. I would not touch this company for anything I expect to use for longer than 2 years.
Check out xprotolab (http://www.gabotronics.com/development-boards/xmega-xprotolab.htm) from Gabotronics. Not too fast or too easy to use but it is very capable and Gabo provides very good support. It is self-contained (small oled screen) but can also send info to PC over USB.
Also, the "arduino" teensy 3.1 could be used to make a USB-based scope for ca. $20 (plus some additional parts) and can have a lot of other cool uses too. Check it out: http://www.pjrc.com/teensy/tee... and http://forum.pjrc.com/threads/....