I have a 18x16 foot layout around a two car garage. I have 14 engines, 4 of them with sound, 8 lighted cars, and 8 DS-64s that are , for the moment, powered by the track. All that is powered by one Digitrax command station with no boosters.
My track power connections are all stripped wires with spade connectors under screws on barrier strips.
My switch and light connectors are European style strips.
A suitcase style connector has to be sharp because it has to pierce the insulation and make contact with the wire within. That is what makes me nervous. The contact is sharp and the contact area is therefore very small. I can't say whether or not they work well, because i don't use them. I am just stating why I don't use them. I like the large surface area of the spade connectors under screws.