[liscio]

That is false.

RAM and HDDs in MacBook Pro machines are user-replaceable parts. No warranty is voided provided you install the proper stuff, and don't break your system in the process. I believe the manuals include detailed instructions for the replacements.

The RAM is _very_easily_ upgraded in an iMac. Apple's even designed a nifty door to make this process incredibly easy.

The only point of annoyance here is the HDD in an iMac. The design simply doesn't allow for the HDD to be accessed, and hence it's not user-installable. Personally, I'd never buy an iMac, and I very seldom recommend them.

[2muchcoffeeman]

The HDD on an iMac is replaceable if you have heavy duty suction cups ...

[astrodust]

The good news is these are actually inexpensive compared to other essential tech tools: http://www.ifixit.com/Tools/Heavy-duty-Suction-Cups/IF145-02... ($14.95)

[jarek]

To replace the hard drive in my computer I need the essential tech tool, the Phillips screwdriver. I bought one for $14.95 and the UX on it is amazing.