They're really weighty, and they are reassuringly solid, I have the 270 version, and when full of fluid it weighs a ton. Can be a bit of a pain to fill and bleed air out of, but if you use one of the squeezie bottles with a straw tip it's much better. but it's nice and quiet, I'd get a better led fitted in it probably a bitspower one as teh supplied bulb is a bit on the weak side.