My comments about the motor not being strong enough is from 2 years of observation and experience burning up the router using a surfacing bit. The router can use the bit it just does not handle the mass well. The hp of the makitia will not handle long uses of the weights of these bits and will burn the windings out trying to do it. I would suspect that any bit larger than 1/4 at the head is going to give the makita issues in the long run. This would include large vbits and bowl bits.