Keep in mind that that field has a limited maximum length, and your approach does not take into account anything related to product attribute choices, so is thus not a universal fix, and thus not suitable for all stores. If it works for you, great. USE AT OWN RISK.

And ... remember ... you STILL need the IPN infrastructure working properly if you want your store to be notified of updates to payments, including echecks, pending payment changes, voids, refunds, and so on. So, if you're trying to add item names because you have problems with orders not being added to your store, then the above fix is a huge red herring for you, and you should fix the root problem first instead of making the suggested code change.