I purchased this model to replace a much more expensive model as we found our previous model had a very small seat opening.  Our previous bidet was not made by Bio-bidet and I was skeptical because the price was so reasonable.  This model is far superior and we are very happy with our purchase ...I highly recommend it!  Our plumber although not familiar with these had no problem installing it and the remote is much more user friendly.  I researched the list of toilets that would accommodate this seat and found the selection very large...don't hesitate...you'll love it!