I actually just tested/tasted my beer.
Quick background, I put in way too much malt (and a lb of honey) for my light wheat beer and forgot to take an OG. Promash estimates it at 1.086 where as it should max around 1.05-1.06.
So I debated for a bit and decided to both test the gravity and have a taste. So far it tasts pretty good for being proto-beer, in fact it was really good. I wanted to check the gravity not to know the OG, but know what the minimum alcohol would be. It read just under 1.04 after four days of strong fermentation.
I would say as long as you keep everything very sanitized and do it in a safe location, go for it. Just don't do it every hour, or day for that matter.