Logitech G502 Hero Vs. Steelseries Rival 500
The G502 Hero by Logitech uses a Hero (proprietary) sensor, providing a DPI/CPI range of 100 - 16,000 DPI. This is combined with a 32-bit ARM processor. This results in a tracking speed of 400+ IPS. It uses a USB connection with a 2.1m Braided cable. It weighs in at 121 g without the cable, has 5 x 3.6g weights that can add up to 18g extra weight and is approximately 132 x 75 x 40 mm (LxWxH).
The Rival 500 by Steelseries uses an Optical sensor from PixArt, specifically the PMW3360, providing a DPI/CPI range of 100 to 16,000 cpi. This results in a tracking speed of 300 ips, and a maximum acceleration of 50g. It uses a USB connection with a 2m cable. It weighs in at 129.7g grams with the cable and is approximately 118.75 x 78.34 x 43.34mm (LxWxH).