The EC225 has an interesting variation - below 40kts there is follow-up trim, ie if you move the stick against the spring trim, the trim actuators motor the trim position so you are back in trim again. So you get some spring trim feel to discourage over-controlling, whilst always being in attitude-hold trim. you can manoeuvre in the hover, then let go of the cyclic to scratch your bits, and the heli's current attitude is held.
HC