I just purchased the RT300 and I love it. I think my legs are already bigger after two uses. I think I want to buy a dedicated chair to transfer into when I use it. The reason is that I have a Roho cushion and my chair has a good deal of dump. I think you would want something with armrests to keep you in it and ease the transfer. Has anyone purchased something like this? A shower chair might be something to take a look at.