[quotemsg=16902877,0,702716]It's expandable by the fact that these use standard components and fittings. You need to drain the loop to expand it, but it's available.
Corsair and the others don't have that capability in their AIO water coolers[/quotemsg]
Yes, it's expandable but why you would you spend extra $60 over the better performing Swiftech H220-X. Only reason I can fathom would be the QD fittings and ability to add a water block without making that effort. Swiftech provides a reservoir, level indicator, uses lower rpm / quieter fans, has 50% longer warranty, the block is much easier to install, has the fans blowing in the proper direction, doesn't require a special tool to flip them over to the correct position and provides fan control for 8 fans as opposed to 3.
The only reason I can see to select the $200 Predator over the $140 H220-X is the ease of installing a pre-fileld GPU water block via the QD fittings by folks who may be daunted by filling the loop and bleeding it.
EK had at its fingertips another advantage that would make it more attractive as their physical design allows you to mount 4 fans in push pull. In Swiftech's design, you are physically limited to 3 fans as the reservoir clocks the 4th. But, EK only provided 3 fan headers ? .... supplying a 4th would have been a big reason to spend some of that money.
The performance per dollar is almost 50% higher with the EK and that doesn't include the effect / appeal of those other features. A 1 year longer warranty, quieter fans and the 4 fan ports, 140mm width (especially a 420 model) would make it much more attractive I think.