Given that you can usually find 20l kegs on craigslist pretty cheap (20-25$) I was actually able to sell my fleet of cornies and double my number of kegs without all of issues with the corny kegs. It definitely made it worth it in my situation and I did that prior to building the bigger system so I was only cranking out 20G batches at that point.
I think I remember your thread on that haul! To bad shipping to NZ kills ebay deals and so far I have't been lucky to find slim 20s