OCR1's are absolutely fantastic. I have been commuting to work in Melbourne, Australia with mine for the last 11 months, and I have just passed 5,000km on the speedo. I commute 30km each day, 5 days a week - rain hail or shine and my blue 2004 OCR (Shimano 105) has taken it all in it's stride.
This heavy riding/commuting is what they are designed for. It is still light enough to race even the fastest commuter on the bike trail, and I often get up to 55khp on the flat.
In fact, I have just converted two of my nearby friends who also work into the city to purchase 2005 OCR1's and they now have been bitten by the bug and join me almost every day.
OCR1's are also great for entry level racing in clubs at all levels, where they will provide you with bomb proof durability until you decide you need something a kilo or couple of pounds lighter for serious racing. OCR1's weigh approx 9 kilos or 22 pounds.
I am very very happy with mine. Few tips, keep it serviced at least twice a year and gently hose off dirt, road grime with bio cleaners at least once a week. It is all in the preventative maintenance that will keep you riding the same bike for 10 years.
You cannot go wrong with an OCR1.