Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Heavy, but worth it

This is a great lens and I find that it's one of the first ones I reach for. I love using it at the zoo and while birding. I do notice a softness to the image when I zoom all the way out, but mostly I shoot around 350mm. The images are quite sharp at that length. It's also a bit heavy to hold, but worth its weight in quality shots. Once it's set up on a tripod (or monopod) it's weight really doesn't matter. It's a great lens and takes near perfect shots. Very much worth buying.