Well I made the plunge in upgrading from a JBJ 45 AIO to a RSR 525 XL! I just couldn't get past the limitations of the AIO regarding space, equipment layout, etc., so when I was in the process of moving my tank from my bedroom to the basement, I pulled the trigger on trading it in for a credit towards my dream tank. I would've gone for the 625, but was already at the top end of my budget, so 525 it is! Even so, it'll be a slow process to get things setup and pieces added as I have the extra cash for them. So far I've got a Sicce Syncra SDC 7.0 for the return pump and a Finnex 500w heater. Next will be getting a couple of lights and hopefully a skimmer before too long. None of my old equipment would've been suitable for a jump this big, so it is essentially starting from scratch. Nonetheless, I'm looking forward to the move upward!