My Impressions:
Pros:
Easy application and clean up.
Just wipe clean, with no need to wash off.
Safe to use on any chain, and will not hurt o-rings.
Cons:
None.
Bottom Line:
I highly recommend the use of the Motorex Chain Cleaner when you go to do maintenance on your chain. If you ride in mud and sand like I do, chain maintenance will happen quite often.
I like the fact that you just spay on, let sit, and then just wipe off, then apply your chain oil. It is a very nice way way of cleaning your chain without having a big mess.
Note: Remember to adjust your chain when necessary too. Having the proper chain tension will give you longer chain life, along with proper cleaning and lubing of your chain.