I have PP-Classified and have been looking for an alternative ever since I installed it. Problems I've found with it are:
No integration of vb member profiles. They insist on running their own member and profile setup instead.
Numerous bugs requiring code modifications that never seem to get fixed and which have to be re-inserted every time one upgrades to the latest version.
Numerous phrase and code entries that indicate a lack of understanding of auction terminology.
Support that leaves a lot to be desired. Presumption that you are wrong is the general attitude. When you make your case and a solution is offered, it is curt and not always helpful.
Numerous entry items that cannot be changed or even viewed once ad is placed. Number of days ad will run or when it expires for one.
A general lack of development since Techimo stopped any development and turned it over to the guy who provides support.
An ongoing feud with the vbAdvanced author resulting in a poor compatibility between the vbAdvanced CMS and all Photopost products.