Yes, the reservoir is really tiny. I though it would be little bigger, but it does what it's supposed to do, hold water. I'm get a large reservoir later, but for now it works. It's the cheapest reservoir I could find, which allowed me to put my money on other components like adjustable pump, gpu block, better tubing, and so forth.
I wouldn't worry about it though since a more expensive reservoir won't improve performance. The only difference I found between reservoir is that some are easier to bleed drain/fill than others. This particular one is pretty nifty in that it's easy to drain/fill or bleed compared to some of the more expensive reservoirs. Finally, there is the aesthetics, which varies from person to person. I'm sure there is some one out here that prefers this reservoir to the cylindrical or bay reservoir models.
Edited by Bekster - 7/20/12 at 4:07pm