I used to keep two mice on my desk. A Naga-class MMO mouse for the long Final Fantasy XIV evenings, and an MX Master for the spreadsheets and the writing during the day. Switching took two seconds and felt slightly ridiculous every time. The Basilisk V3 Pro is the first mouse that's let me put one of them back in the drawer, because it does both jobs well enough that I stopped feeling the seam.
The button layout is the headline. There's a normal pair of side buttons where your thumb rests, plus an additional cluster behind them, plus a sensitivity-clutch above, plus the standard scroll-wheel tilts. Twelve programmable inputs in a shape that doesn't shout MMO from across the room. I can bind hotbars in FFXIV without giving up the front of the mouse to a numpad grid, and during the workday those same buttons map to Slack channel switching, browser tab jumps, and a screenshot tool.
The HyperScroll tilt wheel is the part I wasn't expecting to love. Press it in to toggle, and the wheel switches between a tactile notched feel for spreadsheets and a near-frictionless free-spin for long documents. I have spent enough time on an MX Master to know what free-spin scrolling is worth, and the Basilisk's implementation is the first one I've used on a gaming mouse that genuinely competes. It is the kind of feature that justifies itself the second time you use it.
The sensor is overspecced for what I'm doing with it. Focus Pro 30K (35K on the newer SKU) and sub-1ms wireless latency means I have no complaints in any game I play, including the FPS sessions where the 90 grams should theoretically slow me down. The honest truth is that for hip-fire flicks in something like Marvel Rivals, a 60-gram Superlight 2 is faster under my hand. For everything else, including most MMO and ARPG combat, the weight stops mattering after the first hour. Three connection modes (wired, 2.4GHz, Bluetooth) cover every scenario I can think of, and the Bluetooth fallback is good enough that I've used it on a laptop during travel without complaint.
Battery is up to 140 hours on the 35K SKU at moderate polling, and the fast-charge to 80 percent in 30 minutes means I have literally never been caught with a dead mouse. Wireless charging works if you buy Razer's separately sold dock, which I haven't bothered with. The charging cable in the box is the soft paracord type that doesn't fight you, which is a nice change from some of Razer's older accessories.
The annoyances. Always-on RGB drains the battery faster than the spec sheet implies, and turning it off feels like giving up half of what you paid for. Some of Razer's deeper macro features are gated behind a subscription tier, which feels small and cheap from a company selling a $150 mouse. And some Razer honeycomb-style flagship panels have a history of delaminating after a year and a half of heavy use; the Basilisk V3 Pro isn't a honeycomb but it shares the family's parts bin, so I'm watching mine for the second-year coating change. So far it's holding.
The shape is right-handed only, which has been a Razer convention for so long that I forget to note it. If you're a lefty, this isn't your mouse, and Razer probably never will be.
Verdict: Buy this if you play MMO or ARPG seriously and want one mouse for both the raid and the workday.