It has been a couple of years since I purchased a standard, basswood observation hive from your company. During this time, the hive has provided me with hours of endless fascination . The workers' daily routines, early summer swarming and the anticipation of new queen cells hatching are easily observed and really exciting . The colony has successfully over-wintered twice and produced new queens. I replaced the full depth frames with plastic ANP frames which the bees have readily accepted. I thought you might just like to hear from a completely satisfied customer. If you ever have a customer who is looking for a recommendation for your observation hives I'd be happy to tell them about my successful experience.