One of the big benifits of 3d gamestudio is that fact its packed with good tools and is quite versitle when it comes to the genre of game you wish to design. I have had my standard edition for 1 1/2 years or so and I have began and then scrapped 4 or 5 games now. The great thing tho is that I have this awsome authoring tool anytime at my disposal. I have great faith in the engine and now with the pre-made scripts, it cuts creation time down alot.

Some time I may get there with a game I'm content with but to answer your question, Its well worth the investment.

I hope this helps.