I purchased one from Connecting Threads a few years ago and loved it - while it worked! I'm very hard on blades (keep catching the ruler!) so when it got nicked and I tried to replace it, a spring popped out of the cutter and there was no way I could get it back in. I ended up throwing the whole thing away.
If I had known they had a website at the time they may have been able to help me with it.
I may just buy another one now I know!