I was concerned about these as some reviews mentioned that they don't have enough power to suck the resin out of the cup. I've used about 100 of these already and what I observed was the opposite, so I can only conclude that these reviewers didn't heat their resin before working with it. Cold resin is much thicker than warm resin. I have placed my polymer vials in a warm water bath for 10 minutes prior to use and have had absolutely no trouble sucking these pipettes. They seem to be exactly the same quality as the 50 packs I used to buy for $10. So I think it's great value for money and will continue to buy it.
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