For DW would recommend dealing with Clay at Prophet River or Mark at GT Sports.
Good news, found the Commander Classic & PM7 to be exceptional pistols, perhaps a bargain.
Bad news, London Arms is no longer the warranty centre for CZ/DW, you will have to deal with CRAFM...
One of mine arrived with a bunged sight screw - figure pretty straight forward issue to resolve - e-mail photo and e-mail receipt... After 5 months was told they could not obtain the screw, sorry cannot be of help. Did the leg work for them to locate the sight, three months later (total of 8 now) and after explaining for the third time that was a warranty issue - I need to ship the pistol or the sight to receive warranty service - hold detent, lefty loosey, right tighty - that simple to remove and replace the screw...
If I did not want to ship the pistol (as am worried 1. about Canada Post, 2. waiting another 5 months as still no ETA, and 3. unnecessary handling by others) or remove (& reinstall the sight) I was also offered the opportunity to purchase a new sight at retail but they would not know what the retail price would be until after go ahead to purchase it... (sure CRAFM would avoid shipping & handling costs, smith time... but retail it is, thanks Frank).
Had a similar experience with a warranty claim for a CZ453 - after 6 months purchased the parts, 3 months later they came through (total of 9 months). A shirt & hat were sent with it, gesture was appreciated but not change 9 months wait on parts.
Have contacted warranty departments for Ruger, Remington, H&R, & Savage (whether for spares, parts for mods, or warranty) and never waited longer than 2 weeks for an issue to be resolved.
Hence you may want to think of the purchase as one without warranty. Trojans been on sale around $1,000 and are exceptional pistols (a bargain even at their regular price) - not the same bling factor but very good. If you're after SS also consider the SIGs.