[naz]

IMHO..

pros: car feels better (less body roll), car looks better

cons: cost, car potentially handles worse if you pick dumb parts (ie H&R race springs on stock dampers.. Tein S-tech springs), you prob weren't maxing out your stock car in the first place so you would have gotten more actual performance out of better tires, apparently weight transfer happens faster so you get less time to figure it out and its harder to learn

again IMHO, wrap the OE wheels in some stickies, get a performance alignment and maybe get a larger OE rear sway bar if available and call it a day until you have enough seat time / tech knowledge to pick parts yourself without asking the interweb