If i remember rightly, the chassis & topdeck are exactly the same item and cast with the same material as the standard ZX5.
Its the rest of the parts are slightly different plastic - supposed to be slightly more flexible but seemed to break easier than a standard part. I wouldnt worry to much though, as long as you have spares for the shock tower mounts, castor blocks, front gearbox casing & front sus arm mounts you should be fine.
The plastic outdrives are fine with mild motors, but getting metal diffs will able you to run wilder motors with no worries. Not too expensive either.
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