It is only a solution to the malleability issue that rendered TierNolan's original implementation practically unusable (so I just wanted to clarify that malleability is no longer a part of the problem).

I see ACCT with CLTV as being more akin to a street currency exchange than to an exchange like Cryptsy (i.e. useful in the same way as a street currency exchange is for fiat when you are traveling abroad but not very suitable for the purposes of day-trading and cannot be used for high frequency trading of course).

If the purpose of say obtaining LTC for BTC was not to day trade but just to have some LTC as some sort of hedge or to use for some other purpose then you won't need to trust an exchange like Cryptsy being the point.