I was about a week away from having Total Knee Replacement surgery and knew that I would need an elevated toilet seat. There are many options here on Amazon, and I spent a few hours reading the reviews, before deciding to purchase this unit. Keep in mind, if you have never had a knee replacement, it is nearly impossible to prepare ahead of time for all of the items you take for granted on a daily basis. Using a toilet is one such item, especially the first few weeks after surgery. I noticed that the lions share of people reviewing these products do NOT provide vital information on reviews to help with the decision making process. Since I am so satisfied with this unit (and I am NOT being compensated in any way shape or form), and I have NOTHING better to do post knee replacement but recover, here are some items you may find useful.1) I have a standard height Kohler toilet that is 32 years old.2) BUY the unit a week or so before your surgery and practice using it with your bad leg being straight out stiff as it will be post surgery! Don't wait until you get home..!3) The feet of the unit worked perfectly fine on a ceramic tile floor in my home. The tile in our home have a flat finish, but I am nearly certain it would work on a gloss finish tile and certainly laminate, vinyl goods and carpeting.4) and probably most important - I am 5'10" tall, and weighed in the day or surgery at 195#'s (birthday suit) I have a medium frame. My legs fit into size 30inch jeans and I have a 38 inch waist. and YES , my feet DO TOUCH THE FLOOR, when sitting on this...! I had absolutely NO problems what so ever getting on or off of the unit. I see the units are made in several sizes for different size behinds etc.5) For the guys - there "is" a bit of a challenge peeing in the unit due to the way it is raised - NO BIG DEAL...! At the hospital they have pee containers that hold about a quart with a flip lid, I'm sure you can find these on Amazon (my wife said she saw these at Wally World). Simply pee in the container and dump into the toilet - PROBLEM SOLVED and it is actually much easier. My wife has a container she uses in the boat, that I am sure would work for the ladies having knee replacement, if you so desire.6) Finally the unit has a design such that a "tongue" of sorts fits "under" both the toilet seat and lid that secures the unit. I have NOT felt insecure not even once getting on or off of this unit, and it has not slipped or budged a fraction of an inch when doing so. Our home has 2 full baths and one half bath – so I have NOT had a reason to remove the unit for ‘others’ to use the toilet, so I can NOT speak to ease of removal. To be honest, once you have your knee replaced, you have to be selfish and focus 100% on your self and your safety. Having said this – the unit went on easily and I would ‘guess’ it comes off just as easy if you only have one toilet where you reside.Of all the items I purchased before the surgery, in preparation of the surgery, this was, by far THE BEST INVESTMENT I made...! This all being said, I give this a STRONG 5 stars. I hope this review helps those that are wavering - if you didn't get enough technical information from other reviews. If you are having TOTAL knee replacement surgery - GOOD LUCK ...!! Keep in mind that it is a process..! Your knee(s) did not go bad in just a couple months (unless you had an accident) and they won't get better after the surgery in a couple months. But know this , if your surgeon is competent as mine is - you will ONLY get better...!!