I have a Bersa Thunder9. It is more reliable than the Walther p88 from which it is copied from. This is probably due mainly to its more looser fit. (The P88 it very tight.) It does not shoot as accurately as the P88 but does well enough. No failures yet from ~1000 rounds. (Actually haven't shot it for awhile due to other guns in the stable.) Certainly, it is nowhere near the quality in fit and finish of the Walther but for a gun at 1/3 the price I didn't expect it to be.
Since you cannot get hi-cap mags for the Thunder9 nowadays, you might want to consider the FireStorm Mini9. It is (IMObservation) made by Bersa and is essentially a compact version of the Thunder9 (with finger groves). The one I shoot with is as accurate and reliable as the Thunder9.