best and most easy to use VST synthesiser, with this many/wide sound options. i make Basedrums, Hoover, ARP's Atmospheres/pads for 10 years now with sylenth, no sound was to hard for sylenth, always working even with a pentium 3 processor with 512 MB RAM.
It doesn't get any easier than this... If you don't have Sylenth1 in your collection, you're not a producer. Coming from hardware, Lennar Digital was the first to make me realise what we could do inside a PC. Even back then when cores were low, this thing would make our speakers sing. I never liked it's look but it's look is perfect, everything's where it needs to be. If you don't understand synthesis, a few hours with Syleth1 and all will be revealed.