After set PCC with 2 DSL lines, I realized two cons:
1-Speed tests do not match real bandwith;
2-Latency and jitter have incresead too much (got short disconnections)
Now I’m wondering why:
what do you think about it?
That’s true, PCC is really a trade off. Its not the first choice, its a last resort when there’s not another choice (a very handy last resort).
You won’t see it in speed test because speed test traffic will only flow on one link.
Try downloading torrent and you’ll see both link utilized.
Also what are you using as Per Connection Classifier?
both addresses?
both addresses and ports?
src addresses?
Try a different classifier.
Yeah, I used src address mangle rules.
I hope to find another way to balance it.
Maybe I should use bandwith based load-balancing?
What do you think about?
I’ll make a compromise on this, especially if you need a reliable connection. (since PCC tend to just throw you on each link)
I’ll make half of the LAN clients go to WAN1 and the other half of the LAN to WAN2.
See here: http://wiki.mikrotik.com/wiki/Load_Balancing_over_Multiple_Gateways
I much prefer some form of Policy Based Routing as well. Sending some customer or some traffic classes out one gateway is how I usually do it as well. That works every time and is very reliable 
bandwith based - easy scalable, control of connections, failover / own problems
policy routing - easy to implement, exact control of traffic / scalability problems
I don’t know…