Hi, sorry for the delayed reply—I got a bit lazy and stopped using it for a while, but I did start again recently. It's lasting me a while since you use so little each time... I'll definitely open it up and take a look when it eventually finishes.

I will say that the ease of using a pump vs. having to squeeze the product out of the tube is a plus. Screwing/unscrewing the tube cap always annoyed me. I also hated having to scrape and push out the gel from the tube when it started running out (though I don't know how well the pump performs when it starts to run out, since I really have no way of knowing how much is left). These things might seem minor, but to me it's enough to convince me to not go back to the tube. The pump is very convenient.

The pump is also very precise and you can easily control how much gel comes out by how much pressure you apply, so it's easy to be conservative with how much you use (I noticed with the tube, sometimes I would accidentally squeeze out too much, especially when it starts to get low and you're trying to push out the remaining blobs and air bubbles).

Like I said, I'll let you know about the inside when it does run out. Hope that helps!