Team Water Reservoir all the way! I will never understand why people choose bottles over bladders...and this new design has some awesome features. The back panel does help it slide in easily. It's faster and easier to fill than the older round opening. I've never had problems with leaking at the opening or quick release. I have a feeling that anyone reporting that is having leakage due to user error. Drinking from it is convenient- never have to stop to take a sip of water. I do slightly worry about the quick release breaking if it was to be stepped on or severely crushed and hit at the wrong angle, but I take care of my bags, so that concern is more so a pondering of how much force it would take to break it. The quick release feature is SUPER convenient. I don't have to struggle with the tube getting it in and out of the strap when I need to refill it. It definitely serves its purpose. Taste has never been an issue. Wash out the bag and tube and you'll be fine. My one frustration is the valve and on/off mechanism. I can not figure it out. I fight with it all the time. I have even broken one. I miss the old design. The old design had a more user friendly on/off mechanism and angle. It also had a fixed magnet that I like more than the new magnet that moves up and down and all around. The 3L has served me extremely well several times in the desert in August up to 14 miles (with play time). If I go anything more than that then I take an extra container. Backpacking in wooded areas I can go a full 24+hrs without needing to refill it. I have switched out all the 2.5L reservoirs that came with my bags for the 3L and it fits in those compartments just fine. Clean up is easy, especially if you get the brushes. This reservoir is one of the most important parts of my set up. Of course I recommend it.