Well... Assuming that Geasa and Ways make a comeback, that comparison no longer holds. Rating 3 Increased Reflexes is then 1.75 Magic with Geasa and a Way (Assuming Stackability), vs. 2 Magic with Synaptic Boosters.
Not so bad now.

Of course, assuming you can get Delta-Grade Boosters, the 1.5 becomes .75, and we are down to a single point of Magic sacrificed. Hmmmm.........

I'm only going on what's available at the moment... in previous editions (mostlySR3) I used geasa a lot

I remember one player who had character that always wore a favourite pair of namebrand denim pants when on a run, claiming he worked better magic while wearing them.

No matter how beat up, bled on and bleached by a variety of nasty reasons, that piece of growingly tattered and repatched apparel became quite significant to him, to the point he actually had problems working his mojo on laundry day while they were in the wash.

The brand?

I thought that would have been obvious.

They were Gueassa Jeans. ;P