Personally, I tried as many types as possible during my PPL course (C152, C172, PA28 160 & 180 & Glass cockpit), and also flew some sorties at other locations than my ATO when on holiday abroad. I felt it expanded my horizons and widened my skills.
However, these were just 'tasters' and I completed my course on the PA28 I was flying from the beginning.
I think it depends on you and your personality. Go for it for an hour and you will soon realise if you feel 'lost' with a new cockpit layout and flying characteristics/nose attitude etc. etc. If you are indeed lost, then just go back to the C152. If not, then stay with the new one.
Sooner or later, you will probably want to change the type you fly, but don't force it upon yourself too early if you don't feel comfortable with it. But do try it, you've got nothing to lose.
B.