The only downsides are the gold shroud that may clash with your color scheme, there may be some pump noise (assuming your case is very quiet), and mounting the rad may be tricky in tiny cases.
How does pump noise compare to regular fan noise? I haven't ever had any water cooled stuff so I'm not sure what to expect. I have to image the card even with pump noise is quieter than the one fan evga solutions when idle and under load, but maybe I'm wrong?