freebsd-update (custom kernel)

I would like to know about freebsd-update command.
It is rumoured that freebsd-update command does not work well with custom k=
ernel.
First question is the following :

> su -
#freebsd-update fetch
#freebsd-update install

Does this command work well?

The answer is .....
[A].Always work, [B]Depend on my computer.

Second question is ...
For example,if I upgrade from FreeBSD 7.4 to 8.2 by freebsd-update command.
Can I upgrade without failure?
I would like to know only "success rate"?

The answer is ....
[A].about 100%, [B].about 80%,[C].about 75%,[D] less than 50%

Thanks in advance.

---
Inexperienced FreeBSD user: Level 1
pow 1, spd 1, vit 1,int 1,luck 1
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