Yes, that section costs 450 pesos each way -Muy caro!-- The road from Sanchez takes about 20-25 minutes longer; however it's in MUCH better shape than a year ago-- I always take the highway when I must drive at night or in the rain--
As Susan said the road from LT to Sanchez is much improved... meaning nice pavement and no potholes as has been the case. It is still mountainous with sharp switchbacks whereas the road from Limon to Samana and on to LG is much easier driving, as is the new road through Coson to LT. Whether the new road is worth the time saved vrs money spent is a personal choice