I started out with an EX1/Pilot combination. It flys great if you are only using the EX1. That combo worked well through the addition of a (single) wireless receiver, shotgun mic, clip-on mattebox, but that was about the limit. Light, compact, stable. However, as my accessory list grew (Lightpanels light, 2nd wireless channel, etc.), I had to upgrade to the Flyer LE. On the Pilot, follow focus, wasn't an option with any other accessories. Low mode wasn't.
EX1 is a nice cam to shoot with. A spare AV cable can be had for about 20 bucks and chopped to make a short video feed for the monitor. On the Pilot, if you are handy with a soldering iron you can make a cable to power from the sled which will help with the weight.
I haven't used the Merlin, but I don't see how it would work with EX1 unless the camera was stripped.