Struts degrade very gradually often it's hard to notice. Mileage alone is not a good indication, but in general by 50K miles most of the damping on these budget struts are gone. So I agree with Monroe, Gabriel, and KYB (Toyota OEM, aka "K
) about that 50K mile figure. Of course, the excellent Bilsteins are supposed to be good over 100K miles. I believe that too. So 183K miles is most likely, but not to say your struts are to the point of needing immediate replacement.
Besides a second opinion from a reputable shop, I would check the Monroe FAQs. http://www.monroe.com/support/faq.asp
For example, read the Q&As about the topics we have mentioned:
"How many miles do shocks and struts last?"
"How do I know when my shocks or struts need to be replaced?"
"What will happen if I don't replace worn shocks or struts?"
"Are there any other parts I should consider replacing while having my struts / shocks serviced?"
The QuickStruts will give you all new components but at a higher cost (not that much if you ask me). If cost is your concern then at least do the strut and the mount. You can take a peek to see if there are cracks or dry rot on the rubber bellow and insulator. I'd go with all new components and the easy to install assembly.
The said my Struts are weak. Is this something that needs to be changed soon?
So the Monroe Quick Struts are the ones to get?