Ulysses, I beg to differ.
First, the manouvre you describe is actually an"aileron roll" which bears only a passing resemblance to a "slow roll." In competition, the slow roll should be flown without gain or loss of altitude, and certainly without any initial pitch up that you mention, or it would be heavily penalised by the judges.
Most types certified for aeerobatics will fly the manouvre, but success depends on piloting skill. As a general rule of thumb, if you can slow roll a Tiger Moth (circa 1930, with almost non existant ailerons, and no inverted fuel system), you can slow roll anything.
DB6's post is good reading on the subject.