I'd highly recommend getting one. I got mine a little over 1 year ago and I haven't looked back. It's great for mixing up your routine and it keeps me more alert throughout the day.
I don't stand constantly, only around 2 hours/day tops, but that's enough to make a difference for me. Also yes, get one that will lift independently on both sides, as to not make it crooked, e.g. if you have more weight on one side than on the other (monitor etc.)
I have this and I love it:
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Also make sure it's stable. Nothing worse than a wobbly table
Link?
Do any of these remember both the standing and sitting positions? That would be cool.