It isnt too big a deal switching Tests midcycle, I've done it without a hitch before. I've used Testanon and liked it---much cheaper than Organon Sust, but the same results as far as I was concerned. You will like it better if you mix it in the same syringe with EQ or something. Make sure to massage the injection site for about 5 minutes after injection and warm the syringe beforehand.