I like how it automatically creates new product variations for me, which makes things so much easier than having them manually created by hand! The only thing i dislike about this software are some of its quirks but they can be fixed with an update or two from their support team (which has been very responsive).
If you're looking into creating custom products then definitely give repricexress another try as there really isn't anything out here comparable in terms of price point nor functionality when compared against other competitors such as UpSellers Pro etc.. As long as your willing enought to put forth effort towards setting up all these options correctly - everything will work itself eventually :) It took us less time getting our first few items priced right using REPXPRESS rather than doing them manually ourselves via Excel templates. We were able to get back under.