"As you know, Iím a repeat customer of optipettes. Iíve compared many brands of pipettes and think the optipettes are the best value for money in NZ. They are similar in feel to the gilsons, comfortable to use and durable. We have noticed that they stay accurate for longer than other pipettors, infact, we have not even had to re-calibrate ours yet. I also like the fact that they are fully autoclavable and take all kinds of tips. I have some epindorf pipettes that are very limited in what tips they will take. I would recommend them to anyone."