I have the SRM-225 and I must say, it is one of the best string trimmers I have ever used! I used to use the curved shaft and I was very impressed with this straight shaft. The only thing I didn't like about it was the shield was small. It would have been nice to have it larger to protect the operator better. One of the biggest "pros" with this trimmer is the pre-mix of gas and oil. When I got this trimmer, it came with a small container and took all the guess work out of mixing the gas and oil correctly. You can purchase the pre-mix at Echo's website or at your local home repair store, automotive store or Wal-Mart.