Wired reflexes cost the same amount of essence as it did in third when nearly every other piece of cyberware cost a whole lot less, on top of that Synaptic Booster does the same thing. But let's look at the costs.
Ware essence nuyen
Synaptic Booster (1) .5 80K
Wired reflexes (1) 2.0 11K
Synaptic Booster (2) 1.0 160K
Wired reflexes (2) 3.0 32K
Synaptic Booster (3) 1.5 240K
Wired reflexes (3) 5.0 100K
Even you make the wired reflexes delta grade, you wind up paying more in both essence and nuyen. So why would you ever buy wired reflexes unless you were totally strapped for money? If it is the reflex trigger then I can understand a little more essence and money but not this level of costs.