Safety gear for chainsaw use is a must! I have been a full time tree surgeon for 15 years and have seen more bad injuries than I care to list here, and even more near misses!!
Best bit of advise I can give to anyone who just need to cut logs, bit of fencing or nothing else to demanding is buy one of the smaller sthil chainsaw about £200 quid and buy the new Oregon power sharp chain and bar for it (about £50) as a sharp chain is safer and it makes your engine last longer due to not getting abused.
Plus 12-24 months down the road stick the original sthil bar and chain back on and sell it on EBay for about £150! No service, no cheap replica problems to deal with.
If you have a large tree or trees to deal with then get a quote from a professional, you would be surprised at the amount of work you can get done for the cost of a big saw. Safe cutting everyone!!