Are expensive wireless gaming mice worth it over a budget model like the G305?

It depends on weight and feel priorities. RTINGS rates the ~$30 Logitech G305 a 'good mouse for FPS gaming' with great click latency, and budget-focused communities call it hard to beat for the price. The trade-off, flagged repeatedly on r/MouseReview, is weight (it runs heavier and uses a single AA) versus the sub-60g rechargeable flagships. If you don't need ultralight competitive performance, the savings are real.