  We show that for all $n \geq 2$, there exists a doubling linearly locally
contractible metric space $X$ that is topologically a $n$-sphere such that
every weak tangent is isometric to $\R^n$ but $X$ is not quasisymmetrically
equivalent to the standard $n$-sphere. The same example shows that $2$-Ahlfors
regularity in Theorem 1.1 of \cite{BK02} on quasisymmetric uniformization of
metric $2$-spheres is optimal.

Metric Geometry