Hi My current ,three year old, 17" MacBook pro is showing signs of failing. Occasionally randomly switches off when using battery showing in excess of 2hrs charge left (battery was replaced 6 months ago, also replaced the hard drive a year ago). Slow performance and spinning ball quite a common occurrence. We have checked it with TECHtools and run all of the repair etc. This shows no signs of issues but machine still does what it does. Use it all day every day. I see in the buyers guide that the are updated on average every 208 days. We are now at 178 days. I would hate to spend all that money and find out that its updated within a short period. Does anyone think that an update is imminent? Thoughts?