I don't get posts like this. Every buggy has inherent weeknesses. If you go into racing expecting to break, you're going to break. Hell, even when you don't expect it, it happens, it's racing.
My B4 is no less durable than my 22, or Cougar, or RB5. They have all been through whatever hell I've put them through and been more than forgiving. If you're racing or even bashing, and concerned about breaking, then pick whichever is best supported by your LHS. The most robust cars break, and it sucks having to wait for replacements.