The thing to be aware of about Falken RT615's is that for being a near slick, the RT615's UTQG is 200-A-A, which isn't really that great compared to BFG Gforce KDW's at 300-AA-A (which is a regular street tire). The KDW's will make you stop faster (AA is better than A, obviously) and last 33% longer... according to regulated government tests, anyway. Take the government numbers for what they're worth I guess(?)
But consequently, for being a near slick, a 200 treadwear rating is not too bad... but judging by the look of them, any kind of rain would be a very bad idea... I've never used them, so I wouldn't know though. They don't appear to have water channeling in their designed purpose, so for a DD that may get stuck out in the rain, they may not be the best way to go.
I would recommend something with a 250-300 treadwear rating if you're not doing serious performance driving. Otherwise you'll be wearing down soft compound rubber without putting any real demand on them... which is a waste of money.
BFG Gforce tires (KDW) are a solid choice, goodyear Eagle F1's are 100% win as well. RT615's sounds like something more suited to a weekend track warrior.