My opinions below
1) I believe you should be able to achieve max speeds (but as usual, you'll need to test it)
2) Yes you can load balance up to 4 (or 5) connection depending on what is connected to your LAN. However you'll need to understand that 2 x 10mb /= 20mb.... you cannot achieve twice the speed, only balance it over 2 x 10mb line (your peak speed is of the fastest line)... you need to read the more technical (and limitation) part on load balancing
3) I think the DIR-615 is seriously a hopeless router. The wifi is decent, but not as good as the 751G. I rather you install the DIR-615 as a 2nd AP, to extend coverage, or enable 1 of the router with 40mhz and the other one with a more compatible 20mhz (Apple doesnt work well on 40mhz)
Before this, I was a big fan of DD-WRT enable routers. Every compatible router I had, I had to flash it, and tweak it.... however, after using Mikrotik, I find the DD-WRT routers a little dated. They have had little updates and hopeless QOS (free version). I think DD-WRT is concentrating too much on their paid version, their free version is lagging behind.
Any day a stock ASUS RT-N13U, in my opinion does a more solid job than any similarly priced DD-WRT compatible router. With a USB port, the Asus could also be enabled for 3G. Great feature, on a under RM200 router.... and works so much better on stock, than DD-WRT.
Today, all my routers Linksys 54GL, Asus N12, Asus N13U are all used solely as APs connected to my Mikrotiks. I must admit, Mikrotiks strength is not in the Wireless AP part... They are great as a Router (hotspot, QOS, VPN, etc etc)
I have also been testing the Ubiquiti Picostation M2 with Mikrotik setup. It is a seriously good AP combo. However I was expecting it to blow away the Asus or even the 751G, but it didn't.... it is GOOD.... just not up to my expectation.... I was expecting so much from a company who specializes in APs and PTP equipment....
PS: I am using most of my setup for my work and home. With a limited budget, I need to get the most of every RM spent. Would love to try the Draytek, but at that price point, my expectations are really high....
A true sifu and a good insight for us.
Can YES modem attach to mikrotik?
Vigorfly200 ( rm300 ) can dial into YES GO Dongle.