When I first got this toy months ago, I was sitting on a 2.5' table sitting straight on the plug to get the toy to go in. I had the TR105 and that worked just fine at the time (other than getting some coccyx pain). With that setup, the toy just refused to go in. I tried probably 30 different sessions to get it in.
Then, a friend on Reddit told me to change my setup, so that I was kneeling onto a stool putting pressure from the front instead of the back. And that did the trick!! I can hold onto my mattress and bear all my weight onto the toy until it pops in. I have gotten it in maybe 4 or 5 times now and I am just in heaven.
It is definitely an experience getting this toy in, but once it is in, you definitely feel full. It presses on all the right spots, and I just love my loose sloppy hole for finally taking this big boy.
Next step is either the TR120 or the Post 120... Wish me luck!!