1st, the movement is not a copy of the Valjoux. The A7750 is a copy of the ETA 7750, both of which are known to be reliable movements (when properly serviced, which means you will need to find a watchmaker to service it upon arrival since rep movements are rarely in good condition when they are installed in your rep watch). Regularly serviced (all mechanical movements should be serviced every 5-7 years), the movement should last a lifetime. However, you should expect that the case parts, especially the crown/tube, will not.
Contact RWG member Ziggyzumba (there are hundreds of threads by & about him - he is very good & very reliable).
Very slow to ship or respond to emails (my last 2 Silix watches took nearly 3 months to arrive), but generally reliable.
By the way, this is NOT an accurate Daytona rep. Read this (you will need to research current websites because they may have changed since this was written).