So, after many years of using FL's pirated version (straight back to Fruity Loops days) to finally owning a full license, I can say the feeling is exhilarating. FL Studio, in my opinion, is the best DAW out there, because it caters to those who prefer the simpler pattern-based way of doing things, and with its new versions also welcomes those who come from a more conventional DAW background (Cubase, ProTools).
FL Studio really isn't the easiest DAW to learn (which DAW is?), but there are a ton of resources and training that anyone can access completely free of charge. Other than Ableton, I really don't think any of other DAW is as popular. Although it takes some learning, when you've learnt it, there's nothing you can't do in it; it really is that powerful.
The stock sounds are synths that come out of the box are more than decent, and range from stellar, to great, to decent...to blah. But it's more than enough to get your feet wet. To truly see the full potential of any DAW out there, I'd advise anyone to get some VST synths, instruments and mixing plugins. But right out of the box, Image-Line gives you all the tools for the job, and then some. Speaking of tools, I have to touch briefly on FL's most powerful tool; the Piano Roll, which is arguably the best piano roll of any DAW - it's extremely powerful and versatile.
What's best about Image Line and FL Studio is that it's the ONLY DAW on the market that gives you Lifetime Free Updates for the version you purchased! Yes, you heard correctly...you never have to pay for an update to the version you purchased. So I really don't know why I took so long to purchase this.
My only con with this purchase is that I didn't receive the USB flash drive other users got. Instead, I only received the Getting Started manual and a serial license to register the product on Image-Line's site, which is good. But I was really hoping to have a physical product, for sentimental reasons. A black box just doesn't do it for me. But I suppose they stopped shipping this with the flash drive. If this was an error, I'd be happy if Image Line could send me the flash drive.
All in all though, this was an excellent purchase. If you're still on the fence about getting this, don't be - just buy it and start making the music you've always wanted to make!