To be absolutely honest and with the understanding that it's just one person's opinion, I don't believe a Master's Degree will buy you anything other than a heavy bill to pay back and unreasonable expectations of how far you should be able to walk over the proverbial water. In fact, it may hurt you as being "over-qualified" unless you're going to work for "someone special".

You'll also run into people like me where I don't hire nor even consider a resume based on how many letters a person may or may not have after their name even if they're MS Certs. You'll still have to pass my interview and, although I'd likely give you a break on your length of experience, I wouldn't give you a break when it comes to answering questions about things even if they require experience to find such things out UNLESS you're applying for a Junior position (usually temporarily Junior for a year or so to earn the "Senior" label) where training is expected.