Used S4 dont really recommend it. Check other sites theres just not enough hard line information on it. Its up to you. I personally think it shouldn't be used as a bridge as it does alter your body chemistry. It can effect your eyesight and the jury is still out on how temporary that is. A lot of people are saying temporary others not sure.
You will notice strength increases quickly as well as a more cut up look. Used it for 2 weeks to start a cycle. In my opinion dbol or abombs are better money well spent. I ran 50 (mcg?) daily for the 2 weeks. If you do not have access to dbol, abombs or similar, I think s4 is not bad I mean the stuff works, I am just worried about side effects. I still have a lot of S4 left and will keep beginning my cycles with it til Im out, as I cannot say I noticed the sides really, but everyone is different.