Camera Labs reviewed the Tamron SP 150-600mm f5-6.3 VC G2 megazoom. They praise build quality, image stabilisation, auto-focus among others.
From the conclusion:
An improved image quality combined with a good image stabilization, improved sealing, shorter minimum focus distance, and an acceptable size and weight makes Tamron’s new 4x super-telephoto a compelling package. It’s a pity that Tamron didn’t position it as the successor to their A011 model at the same price-point. But it certainly earns a Recommended rating.
[via Camera Labs]