I've been using the New Zealand Strike Indicator for a year or so now. I really like it and am happy to say its one of the few products that live up to its advertisement. For small flies like midges it is super sensitive and will detect even the slightest of strikes. Definitely a product worth checking out.
The Tacky Day Tripper box also works great for small flies. I little pricey but very happy with the box. I'll be picking a few more of these up.
And a short video I put together from the trip.