Shifting coins between alt and btc on an exchange can give you nice results

if for nice you mean lose a lot
if by shifting he means trading altcoins with bitcoin, then It would be a great way to invest your bitcoin and grow them.
but it is like any other investments, with risks involved and you have to make an informed decision and not just but anything that looks good or anything that you have read and supposed to be good.
nice results means that you haven't lose money and maybe you can get some profit. yeah in investment we can't avoid the risk that you may lose your money so we can only to do is to take the risk and sometimes maybe our investment will success someday.