Locking wheel nuts - get rid?

My bolts actually look ok but have been looking at the TPI ones. The problem I have with the 197 is the bolts are 19mm but the locking nut is 17mm! Are the black TPI ones durable as I like to take my wheels off monthly.
 
It's hard to tell in that picture as they are very similar to standard, which make them an even more attractive option.
Very durable too, had my wheels off a fair few times this year.
 
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locking wheel bolts are part of the thatcham insurance rating for the rs models over here along with the alarm to back up the standard immobiliser...

think the tpi bolts is the way :drunk:
 
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