Hard to say if "many people having a lot of trouble with this update." A Bridge problem of repeated recaching of raw files has been reported with acr 7.3. See discussion in this thread:
In general if you don't need what is in an update it seems reasonable to wait a week or two; but with this one, note Adobe's security bulletin -- acr 7.3 includes a security update:
Reverting to 7.2 requires some system skills (also discussed in the first cited thread above).
It's not all that hard to say if one has experienced it. It's the first time I've ever had a problem with an Adobe update but there is definitely a problem with this one and many people are reporting the same thing. Photoshop Standard suddenly becomes a trial of the Extended version and keeps putting up annoying messages until it is dealt with, in my case by reinstalling, which seems to have worked. From what is being reported it may be Mac only as I've not seen anybody say they are using a Windows machine.