Managed Funds - invest directly or through a broker?

I'm thinking about going into a few managed funds & have come across InvestSmart.com.au which gives a breakdown of different funds. I'm not sure if I invest directly with the fund itself, will it save me on any trailing commissions that they would pay the broker, or would I end up with the same return as if I used InvestSmart as my broker? Any extra benefits of using this company rather than going direct?