Not really, I have similar or actually probably same sets (and same 'topics' to think about with various bridges and tunnels, track splits etc). I also have these straight or curved stuff in light and darker gray. Cheap non-original stuff is easy to spot - it simply doesn't fit nor hold as well. It doesn't matter whether its bricks or different stuff.

Due to economy of scales, Lego can manufacture those at consistently high quality and relatively reasonable prices. Competition aiming for same quality would be at least similarly priced. Also, its incredibly sturdy. So far I haven't seen a single one crack or break in past 2 years. My kids are not psychos but they for sure have no idea yet about treating their toys with care.