CathyA,
I actually have one of those suction cup grab handles and I love it. I got it at Bed,Bath & Beyond. I was a little hesitant I will say, but it's worked great for me. When we remodeled our bathroom I wasn't at a point where I thought I would need one. But very quickly I figured out that it would be necessary. I bought the chrome looking version, the suction cups are huge and very strong. I'm about 165 lbs and it feels very solid when I pull on it to get up. I actually had a hard time taking it off the tile to reposition it. That said, I do place it ON the tile, not on the wall. Yes, a permanent version, installed into studs would be ideal but if you don't want to rip up your tile/bathroom or go to the expense this works. I'm going to get a second one so I have 2 different angles to help me up.
Tk care,
Deb