Yes I like them but I didnt want to spend that much.
I bought 3 Avanti aluminium bottles for the same price and they come with both the solid stopper and the sip lids.

The sipper lids are gravity fead so you tip up the bottle and take the first mouthful and then you tip down to let the air in. Repeat for your next mouthful.
If you open the nozzle and tip the bottle you will empty a small amount of water, but the rest stays in the bottle untill you tip it back.
This is the feature that stops you loosing all of your water accidentaly.
Better to tip a few more times than accidentally loose all of your water.
I wash them normally and dont have any probs. I didn't have the oily problem with mine. Either it wasn't there or it disapeared when I washed them after I bought them.

I usually use the solid stoppers with the 2 on my pack because you can attach a cord through the top so you dont loose them.

They are a tough bottle, and I dont usually use my plastic bottles anymore.