How have the Sarsilmaz 2000 pistols been working ? Are these any good ?
Can't speak to that particular model, but I do have three other Sarsilmaz made Pistols, the B6/B6P, K2P, and K2-45.
They've all been great with no issues, and I liked the K2P well enough that it was my main CCW for about 4 years, and still could serve in that capacity.
It should be noted that the Sarsilmaz Cz Clones are extractions of the Tanfoglio designs which improve upon the Cz design.
Are they worth the $400 that most places are asking for them in used condition ?
In very good to excellent condition, in my opinion, yes!
As with ANY used handgun, value is directly rated by condition and what kind of use it's seen.
All of my Sarsilmaz Pistols were purchased New-In-Box from my favorite Gun Shop.
However, I have bought used handguns in the past, and most did not have issues beyond the replacement of a few Springs.
Are there any weaknesses with them ?
None, in particular. Properly maintained, they will probably outlast many handguns on the Market today.