I currently have a Simmons Blazer 3-9x40mm. It's probably 12-13 years old. I haven't had any issues with it and have shot plenty of deer with it. Is there any reason I should consider getting a different scope? Am I missing out on something I don't know about? If I replaced it, I'd be looking at something in the $100 range - like the BARSKA 3-12-50mm Huntmaster Pro or the Bushnell Dusk and Dawn. Will it be a significant upgrade. TY.