it's a good SSD. Kingston, Intel, OCZ, Crucial are other brands you could consider, but if you're getting a good deal on that drive, you'll be happy.
Based on the age of that laptop, I'd suspect it's SATAII, but there's a chance it's SATAIII.
Don't worry so much about the SATAIII vs SATAII. Yes, if the laptop isn't SATAIII, you may not get the full performance, but SATAIII drives will work in a SATAII system.
It's better to get a SATAIII SSD for a SATAII system than to find an older SATAII SSD to match a SATAII system. Today's SATAIII drives have better wear leveling and garbage collection, so they'll last longer and run faster.