I have 6 months with my FW16. Everything has been good so far, the laptop itself is overpriced but I'd say that the added value of repairability makes up for it. Will have to wait more time to see if they update the mainboard for the 16 inch model, but it has been a breeze so far.
http://webhotel4.ruc.dk/~keld/research/LKH/
The biggest proven optimum is for 3178031 right now.
This should be really done with CUDA, not plain C, btw.