In reply to AlisonSmiles:
Yes they can be a pain when combined with a multi tool. I find it much easier if I have to do any roadside jobs carrying a multi tool and separate small chain breaker. I have a park one which works well.
The CT 5 weighs 77g - if you can afford to carry that much! I have the park CT 6.3 and I've used it quite a bit mainly on other peoples broken chains!