Sriver v tenergy

I have a friend who have Tenergy 64 on fh side and Sriver Fx on Bh side. He found a extrem speed on his forehand and a lot of control in his Bh with Good speed. Before the realising of Tenergy, Timo Boll used Sriver rubbers.

When do you think is the right moment to move on to an other, faster rubber?
I play for 6 years now and as a fairly offensive player I use Mark V GPS rubbers but all my team mates use Tenergy05 and they try to convince me to start using Tenergy05 as well. Should I give it a try even if I feel good with my trusty old Mark V rubbers?

I have recently graduated to AMULTART  butterfly blade and tenergy 80 on both sides and I find the racquet  superb.earlier I used mark 5 and my transition has been smooth.

Earlier I also used to use Mark V both sides.  The most trusted rubber for me for a long period of time.  But, recently I changed my FH to GKI Hybridz-GX and BH Tenergy 05.  Now, I found that I was less rewarded with my strokes.  Hybridz-GX is a fantastic rubber, good spin, speed and good arc to catch the table.  The speed and spin excels in full swing strokes.  Very good for blocking, throw angle comparatively low than T05.  In the other hand, with T05, its a pleasure to hit the ball.  It plays every thing very good.  Very forgiving and you can play any kind of proper strokes with very much ease.  Though it is a very fast and spiny rubber, but you will not feel it because of its strange feeling sponge.  I feel like I am playing with a rubber of 1 inch thick. Strange feeling for me who played with Mark V for long.    

I personally think that nowadays there are many goods rubber superior to Mark V.  If you can control and use them properly, you will be much more rewarded with your strokes.  For beginners, Mark V is OK.

I use butterfly sriver fx for my forehand lots of spin fast rubber and lots of control

I just recently encountered a few players who use T05.  I must admit that T05 has extreme power, both speed and spin.  I am quite a good blocker, but when I tried to block a topspin loop from T05, the ball just went long.  I was quite surprised because the coming ball didn't seem to have that much speed or spin, but when I tried to block it, the ball just went off the table.  I have been a loyal lover of Mark V since the 1970s, but I just took up TT again about 6 months ago.  I put Mark V V30 on my FH and Butterly Flextra on my BH.  After a few sessions, I discovered that these rubbers do not have the potential like the newly developed rubbers.  Now I switched to Tibhar Grip-S Euro Soft for my BH and Tibhar Q5 on my FH, and my shots are more powerful.  I haven't tried playing with Tenergy rubbers as I think they are overpriced, so I can't reall comment on how much adjustment one has to make going from Mark V to T05 or T64.