Hello,
Depending on your needs, that blow up boat may work. Note that it's more of a toy than an actual boat. But it all you want is a way to get from land to boat and back again, and you don't need to very far, then it would work.
If you plan on using that as a real dinghy when cruising I think you will be disappointed. Note that if you deflate it, it will still take up a decent amount of space. Inflating / deflating will also be time consuming. A hard dinghy will be cheap, easy to row, easy to tow, and will work a lot better.
My boat is on a mooring and I use a dinghy to get from shore to boat and back again. My first dink was an 8' fiberglass rowboat. It was free. It was also sitting in someone's yard and had a number of problems. I fixed up, learned about fiberglass, and used it for a year. Then I bought a newer, bigger boat that came with a Watertender 9.4. That boat worked great, rowed nicelly, plenty of space. My problem was that I stored the boat on the sandy beach, dragging it down to the water to use it, and then up the beach to store it. After a number of years the dragging on the sand wore away enough of the plastic that it started to leak. I fixed it a few times, then gave up and threw it away. I found a plastic Walker Bay 10 for $500 and I've been using that for a long time now. I gave up on dragging the boat up and down the beach an now it's on a dinghy dock.
Barry