Anime Taro is my absolute favorite dealer.  =)
(No offense to other dealers, there are some that
I adore that are absolutely EXCEPTIONAL (!!) but
I love Taro's no-hassle ordering system and their
packing job cannot be beat... if I name every
dealer that is wonderful then this post would be
too long and I'd never get to my point...)  ^.~

Every cel I have ever received from Taro has 
been in perfect condition.  They pack their cels
wonderfully and the cardboard is very thick so
it would be VERY difficult for the USPS to bend
the package.  Sometimes sketches have been stuck,
usually not.  I have never received anything
with any dings, creases, etc... I think Taro must
just weed through really damaged cels before they
upload them.  =)  Probably the biggest "flaw"
you'll get from a cel from Taro is that the
sketch is stuck (which isn't always true)...
however, I always assume every cel is stuck to
the sketch when they're scanned together 
(regardless of dealer) unless I'm told that it's
not.  Their scans are pretty clear, too, so
that should give you an idea of trace-line fading
(I usually expect older cels to be more prone to
fading than current series) or spotting.  However,
I would imagine that 99.9 percent of the time,
what you see is what you get.  =)  (I've never
encountered that .01 percent myself...)

Lady Z
(who is honestly trying to get her gallery back
up on her birthday... with all luck!)