Hi: I am a homeowner with a one-acre lot that's a bit of an obstacle course (trees, beds, raised vegetable garden, etc). I'm guessing that it will take 30 minutes of trimming at a time (max). I'm about to buy a Tanaka string trimmer. I'm looking at the TBC-225 and 230. I understand that the 230 has a larger head and some sort of anti-vibration feature. Can you please explain what the difference will be in vibration between the two models. Is there a real reason to go with the 230? Second question. If I buy it from a web dealer (like landscaperpro), can I bring it to another dealer for warranty service (in case I need it)? Thanks.