To chime in. I agree with Brian with the armor, not much difference between the two besides the wait times. I've been on Terrell's wait list since August, no biggie though I already have a set of ATA.
As for TK boots I wasn't aware Terrell sold boots also, that's news to me.
I have a pair of both Imperial boots and tkboots, both very nice however, there's room for improvement with the Imperials. Compared to other manufactures (like tkboots) IB's leather, elastic and pull tabs are much thinner. Also, there's been a concern over the amount of elastic used in the "U" section (excessive), as well as the leather stitching underneath is off center, instead of center. A concern I personally have is the distance between the front and rear sections of leather being excessive causing calf armor issues due to the boot material bunching up, a concern I didn't have with my tkboots.. Most of these concerns have been brought to the sellers attention. Time will tell if any changes are implemented. Being Imperial is the cheapest boot in town it will be hard to ask buyers to wait while the jury is out. Choice is yours.