Carb spacer review for the carb guys out there?

How many of you fellow carb guys are running spacers? I've always wanted to try out one of those badass Wilson Manifolds spacers, but the prices always scared me off. Well turns out a local Factory Stock racer switched to EFI and sold me his spacer for $50 (which is brand new and was $140 new)

Offy Manifold To Weber 32/36 or 38 Carb Spacer

Carb Spacer 4150 Tapered 4 Hole 1.00in

Edelbrock 8725 Carburetor Spacer 1/2 Divided Wood Fiber Laminate

Free Shipping - HVH Street Sweeper Carburetor Spacers with qualifying orders of $109. Shop Carburetor Spacers at Summit Racing.

High Velocity Heads ST4150-4AL HVH Street Sweeper Carburetor Spacers | Summit Racing

Angled Carb Spacer 2 in 4150

JEGS 15420: Carburetor Spacer Tapered Phenolic 4150 4-Hole - JEGS

Spectre Performance 5776 1 Open Carb Spacer with Tube

LCE Pro Spiral Spacer - 1 Weber Carb. Spacer Kit

Free Shipping - Edelbrock Carburetor Spacers with qualifying orders of $109. Shop Carburetor Spacers at Summit Racing.

Edelbrock 8723 Edelbrock Carburetor Spacers | Summit Racing

Carburetor To Intake Manifold 1 Spacer for 1965, 1966, 1967, 1968 and 1969 Mustangs with a 4 Barrel Carburetor on a 289, 302 or 351W Engine.

Carburetor To Intake Manifold Spacer 1 289/302/351W 4V 1965-1969

Street HP—Going Your Classic Holley 4150 One Better!

Free Shipping - Summit Racing™ Tapered Carburetor Spacers with qualifying orders of $109. Shop Carburetor Spacers at Summit Racing.

Summit Racing SUM-210300 Summit Racing™ Tapered Carburetor Spacers | Summit Racing