not too bad at all
good product. in my eyes much better than the ergo hydrolock. in the hydrolock the yellow valve kept snagging and ripping off due to a poor design. the more simpler ergo angle eliminates this, however takes out the on/off feature. i found there was no problems with leaking using the big bite valve on the end of the ergo angle, however when you take your gear off make sure the big bite vavle doesnt end up on the ground under the camelbak as it will leak. maybe a design improvement would be to make the egro angle a standard 'click in' accessory to allow users to utilise the standard on/off valve on every camelbak.
overall though I am happy with the purchase and the product does the job that it was intended for