I suppose I find it easier, less work, to log onto the CDS website and then grab the CDS spreadsheet for each ETF that I need, rather than going to the different ETF companies websites and finding that information. Maybe it's just because that's how I first started to track it. I also find that the CDS spreadsheet is easier to understand and follow than the info from BMO or iShares, because it has all of the information I need. From the CDS spreadsheet you can see the breakdown of each distribution (return of capital, capital gain, etc) and if they are non cash, which is more helpful than just a yearly breakdown that BMO provides.
For example in 2014 ZLB had a non cash Reinvested Distribution Per Unit at the end of December of $0.628834, of which it was made up of a Capital Gain of 99.2047% and 0.7953% was Return of Capital. You could figure this out from the T3 Summary and the BMO website, since BMO does tell you what the reinvested distribution amount was for December 2014. Looking at the CDS spreadsheet it's very clear that ZLB really did have non cash RoC.
I don't believe that the CRA My Account has the trading summary info from the broker, just the T slips. Between the T slips from the CRA and the CDS spreadsheet he can see the breakdown or each distribution. Although it would be better to also have the summary from the broker to verify against.