Five stars because despite its improvable interface, this product is much more than the huge sum of dictionaries you can download into it.
Very unexpectedly and amazingly for a professional translator like me, TranslateIt allows you to add dictionary search sites interrogation into its base by copying query urls + a variable -- and that is not even mentioned above ! This system can and should still be improved, but this is, by far, the best solution for vocabulary search i found after Camino + the "Multi-Site Search" applescript by L. Thompson. (Alas, Camino is slowly dying away, and L. Thompson's scripts have disappeared from the web with the Mac homepages debacle, so even though i have both, i direly needed to have a replacement ready.)
BTW Have been testing the product less than a week and not even bought it already, but after I had problems making the "Office Support" applescript installer for MSWord work, the developers were very helpful and compiled a special "French" version of the installer. That looks like good customer service to me.