The teeth on the brass will most likely be fine. Most of the time when the syncros go bad its the inside of them that get worn so they "bottom out" on the cone of the gear and dont offer enough resistance (due to excessive tolerance)to slow the gear down in order to keep from grinding.
... MUCH more problematic are the edges (points) on the selector sleeves. Check the stopping rings too, when they get flattened out (see below) around the outside perimeter, they offer no drag to grab the sync ring and slow down the gear. My carlikes to eat them up in 4th gear...
buy the ebay shit. Itll be fine.
Nigger.
Pickys:
Flattened stop ring causing grinding even though sleeve is fine as mentioned above (This just came out of the slut yesterday)
1st gear syncro hammered from hard launch (Levi look familliar). Youll know if this is an issue by the trans being hard to getyinto first whilst moving at all... You may even have to double clutch it standing still... Excessive power being put to i forces the syncro ring to try and climb "under" the hub. I have an ide how to alleiviate this, but not the machinery to impliment it.