I've had my ViscoStar for a little over a year now and I use it along with a miniDAWN Treos II for characterizing polymer molecular weight and solution conformation. The data from both detectors is reproducible and reliable. Even more, both instruments are easy enough for my undergraduate researchers to use and maintain after some initial training. The best part about owning and using instrumentation from Wyatt is their customer service. They are very responsive, knowledgeable and helpful on software issues, and they are well versed in application areas. They have helped my group with all issues that we have come across!