I don't know who these friends are, but they're certainly misinformed and they don't appear to be doing you any favours.
There are a great number of professional editors who have used Final Cut Pro since version 4 - but took the trouble to
a. Find out the system and install requirements for FCP X
b. Watch professional tutorials such as Ripple Training and actually LEARN how to use this ground breaking new application.
They (and I) are having very few issues with FCP X - especially since the update.
If you're getting crashes, autosave problems etc, there is more than likely some conflict on your system drive.
Create a new (admin) user on your Mac system and try FCP X from there.
I did this, and FCP X worked perfectly on the new account, meaning there was definitely a conflict on my existing system.
To be absolutely certain my MacPro's system was squeaky clean, I then did a clean reinstall (not TimeMachine) and FCP X has worked reliably ever since.
FCP X application should be in your Applications folder and ideally, your project and events should all be on an external HD and not on your Mac system drive.
I have around 4000 clips distributed between six events at the moment and FCP X is coping very well most of the time.
It helps to work without the waveforms displayed as these slow things down considerably.
Do you have FC Studio or a version of FCP on the same drive partition as FCP X?
This is what Apple say on their current web page on installation practice:
"It is strongly recommended that you install Final Cut Pro X, Motion 5, and Compressor 4 on a startup disk that does not have Final Cut Studio (2009) already installed. Use Apple's preferred installation procedure when upgrading one version of Final Cut Pro or Final Cut Studio to the next. This procedure is not unique to Final Cut Pro X."
They do go on to say "if you must" have the two on the same partition, FCS must be located in a different folder - but I would have thought the words "strongly recommended" and "if you must" speak for themselves.
Andy