"IBU Injector" use in BeerSmith2

Anyone used the "IBU Injectors" as seen on:

http://www.farmhousebrewingsupply.com/ibu-injectors/

They are listed as 50% AA, so I'm assuming they are CO2 Extracted hop resin. I've looked at HopShots before and they claim around 10 IBUs in a 5-gallon back per mL in the syringe, but are these different?

Inserting into BeerSmith2 it estimates closer to 25 IBUs for these injectors.

anyone confirm the use of these?

They are CO2 hop extract, and using that option should give you accurate numbers in BeerSmith.  These are effectively concentrated hop resins so their utilization will vary considerably with boil time, gravity of the boil, etc... but BeerSmith does take all these things into consideration when calculating utilization.

Brad