You mean the nvidia drivers? well they are fine for me. Its just we are waiting for Nvidia to release a WHQL drivers for 4 months in general but no luck so far. Sinc ethis is a SLI card there might be issues on newer games but eventually they are sorted out. With my 590 I dont ever run into a trouble that can not be fixed. They say Alan Wake has issues with Nvidia in general and there is no SLI profile. but I am guessing that this will be sorted out in the next patch.
590 Is a great card for Nvidia Surround. Or perhaps a 580 or 570 SLI. It will have 1.5 GB vram though for each core. Any how. A 590 will beat 460 SLI easily so go for it, or if you really want wait for Kepler. However if you are a person like me and just want the gpu now go for the 590 sure. I love it personally. Though I am not running surround. I wish i did. I just dont have the space for it