I have a Charge and it’s excellent. Far less sweaty than the two generations of HAWG it replaced, very very comfortable (I had gone back to bottle for most sub 2 hour rides to save the backache, use the Charge exclusively now).
Big enough for a riding day out, if the side pockets bother you just use them for gels/food etc. but when it’s sat on your hips I think it’s pretty tricky to fall on them, and they are nowhere near your kidneys, more frontal and over your pelvis.
Biggest pain is extracting the hose to clean it, but if you stick to water it’s not necessary often.
Best bit was getting it from Halfords for £40. Didn’t need a new one but fancied a punt at that price, and I’m really glad I did.