I have bought my son many of the brunder construction toys. He loves them but there are a couple things to watch out for.
1. the plastic is strong but if left out in the sun it will become brittle and break so keep it out of the sun for long periods.
2. the big excavator is awesome but the tracks will stretch and the arm can break at the mounting point. easy fix on the tracks you can take a link out and for the arm they sell the hole arm Assembly for cheap.
Most of there toys are pretty solid minus the small parts like mirrors etc. and most have some replacement parts. sure beats the junk they sell at ( toy r us ) Fast Lane are there brand and they are complete junk