Block-IR...Worth it?

I have all the supplies for a 400w HPS grow system. I'm waiting until I move to set it all up. I'll have a 3ft by 4ft room...should I get Block-IR?

I'm heading to the hydroponics store soon.

They have the 25ft roll for $80 and the 50ft for $140.

I'm thinking of going witht he 50ft roll for definte protection.

What are your guys thoughts?

Is it a good product that is worth it?

I'm trying to be SAFE
Double coat if a nigga's gotta

Yes its worth it, and yes double coat if you can!! Especially if you are in a area that has a lot of fly overs. Anybody that lives near military bases or borders, Block-IR is a super must, especially if you are on the larger side of the cultivation scale.