Does anyone have or used the Merry Muscles Jumper? I ds is 3 months and he loves to jump. I don't want to get one of the Johnny Jumpers, because they look like they have enough support. He has great head control, but I still would like the extra support. He's a tall baby but not a heavy one and I don't know if he would be able to jump well in some of the other jumpers. I have a big open room with exposed beams that the Merry Muscles could be screwed right into. There are no doorways or walls that he would be able to bump into. I also like the fact that you can use it as a swing and there is plenty of room for that too. Any thoughts?