Could you send me a link to the place you're buying it at? I'll show you just the right one. The 300 version has a lower quality sensor and I've never heard of a 100 version D:
http://www.amazon.com/gp/product/B016KG7G90/ref=pd_lpo_sbs_dp_ss_1?pf_rd_p=1944687562&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B015WKY3FU&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0DX8SSSY7C1721X4BW01
http://www.amazon.com/SteelSeries-Rival-Optical-Gaming-Mouse/dp/B00FAN4M3S/ref=sr_1_2?ie=UTF8&qid=1456532725&sr=8-2&keywords=steelseries+rival
Yep that's the old version of the 300. I'm using a rival 100 atm. I tried the 300 at a store, and the 100 is a little smaller and has a less sensitive sensor.
The 300 has worse quality sensor. Never heard of the 100 version so I can't say bad/good. The standard version is what I love to use :)
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