Considering that they are brake rotors I would buy them from a source
with a little more substance than an ebay dealer.

The cross/drilled give U better braking, no doubt

I don't buy brake parts off E-bay, those parts are too critical to safe
operation.  Go to local shop or parts-store.

1] Can get advice or suggestions from a human

2]  Can easily return a mismatched part

3]  Can enforce a warranty, if provided

I dropped cross/drilled rotors into GF's GA, when last brake front-end
do.  They cost more, but I did check braking prior to [meaning stock
OEM rotors] replace, and then after the new rotors.  My measurements
showed reduction in stopping distance of 10 feet with the new ones.

Granted, new pads, and the specific car used in my impromtu test are
real variables, but the sucker no doubt stopped shorter.

Ebay <lutek34.nospam@gazeta.pl> wrote in article
<12j76ohfwkd7s$.vb11k68vmx1j.dlg@40tude.net>...

Unless you're talking about a real race car where the rotors get hot enough
to glow red for most of the race, you probably will not see ANY difference
in street performance.

Any performance "improvement" you "feel" will be, mostly, psychological and
likely undocumentable with the average shade tree garage tools and
measuring equipment.

In street trim, the more metal available (i.e. un-drilled) the more surface
area with which to dissipate heat.

At racing speeds, with rotors whose inner vanes have been designed for
maximum air flow, there is enough air flow through the drilled holes to
make a difference.

The slots allow for the escape of gasses developed under extreme conditions
between the pads and rotors - again, an unlikely condition for your average
"boulevard bomber".....even when braking hard on the Interstate in order to
not miss the upcoming exit.

In racing, EVERY brake application is similar to the emergency stopping
such as above that the street car experiences only occasionally.....unless,
of course, you are in the habit of going from 80 mph to zero in your street
car every single time you apply your brakes.

It's your money......but I would rather buy good quality standard rotors
and sepnd the extra money elsewhere.