Electric vs Manual Pitch Trim
If the manual elevator trim had used a trim wheel, like most airplanes I've flown, I probably would've ordered that. However, I didn't like the vernier knob Van's designed in, so I ordered electric trim. In the RV-6 I got my "grin" ride in, it was a little sensitive, but after a few minutes I got the hang of it.
Also, there are ways to slow the electric trim down to make it less touchy.
I used to rent a Katana which, like the RV-7, has electric-only trim. If it runs away, you have to hold a stick force until you land. It never happened to me, fortunately! However, in an RV, with the light elevator forces, I don't think it would be that big a deal...and if you're really worried about it, here's what you can do:
Install a split trim switch, instead of the rocker switch that comes with the E-trim kit. A split switch requires that both sides fail before the trim can run away...a rather unlikely proposition. With that mod, the worse failure mode is a stuck trim, which is no big deal.