I'm running the bold cyp (300mgx2/week) along with T cyp (250mgx2/week) and love it! It's no more painful than T prop in my opinion. It was a little painful the first couple shots but nothing that held me back from squats or anything. It does crash easy at 200mg/ml in the low 60'sF and need to be heated to get it back to liquid. I was hesitant on trying it too, but got to say I'm glad I gave it a shot. Strengths going up and cardio has too. The only negative for me was the price. Find a legit supplier, make it properly, and you will not be disappointed with bold with the cyp ester.