Foam Mattress Topper

I've been waking up with numb hands and pain going down my arms off and on for over a year. More on than off. Is been painful and annoying. I've seen a doctor and having a more "giving" and less firm mattress is something he suggested. I've been sleeping on this mattress topper on top of my five year old original T&N mattress for a week now and I've yet to wake up with numbness in my hands or pain in my arms. It's been fabulous and SO much more comfortable. I can barely make myself get out of bed in the morning, it's so nice. The topper is very squishy but it doesn't feel like a marshmallow. I sink in just enough to stop any bits of the body that stick out like shoulders and hips to not feel pressure. We've had one of two warm nights and I haven't been too hot. It does feel warmer, though. I usually sleep with a down comforter year around and I'll probably have to get a lighter blanket for this summer. I feel like that's a small price to pay for not being in pain every morning. I have the topper under the fitted sheet and mattress protector. Those seem to be holding it in place well enough. I haven't had to push it back into place. I did let the topper sit in a well ventilated room for 24 hours before using it. It had a bit of a smell when I first unboxed it, but that went away fast. I can't find any cons with this mattress topper so far, only pros.