I have had membership of both in the past but stopped my PC membership as I found a lot of the $1.99 products were not of the quality I wanted, in fairness that is because I had moved on and they had not.  That was before the change to the PC and before Genesis so the quality may have changed but so have the rules.

I have been a member of Prime almost since it's inception and it runs out in August 2013 but I will renew.  So far I have spent $518 with the full price of $1504.19 I have saved $986.19, that is from the Prime Summary that Rendo helpfully add to your account.  I think it is calculated on the full price and does not account for any sale price when a product is first launched.  On the plus side it does not include the extra savings I have made thanks to the higher discounts for Prime members on some vouchers.

Clearly I do not buy every prime product but I have purchased a lot and I have used them all at least once in renders, so for me it is value for money.

Finally you mentioned V5 and V6.  You might also like to have a look at 'Dawn' who should be with us in the near future.  She is weight mapped so you will need at least Poser 9/2012 but I think you had plans in that direction anyway.  My reason for highlighting this is she will be free for a period after launch and will have a version native to Poser which is not the case with V5 or V6.

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2868999

Be warned if you have not been there before as the thread it over 30 pages already and growing by the day.

 

 

 

I use Poser 13 on Windows 11 - For Scene set up I use a Geekcom A5 -  Ryzen 9 5900HX, with 64 gig ram and 3 TB  storage, mini PC with final rendering done on normal sized desktop using an AMD Ryzen Threadipper 1950X CPU, Corsair Hydro H100i CPU cooler, 3XS EVGA GTX 1080i SC with 11g Ram, 4 X 16gig Corsair DDR4 Ram and a Corsair RM 100 PSU .   The desktop is in a remote location with rendering done via Queue Manager which gives me a clearer desktop and quieter computer room.