I have been using Skalarki for about three years and things works very very nice, very affordable price with an excellent quality and support from Marcin is always available, you got responses always.
FDS has good products too, however they seems to be focusing in a bigger and more specialized market and their enthusiastic field seems to be reducing.
Also Skalarki is in constant development, you get new versions updates and compatibility with more and recent products, personally I reccomend it.