you better ask this question in Europe or especially in Germany because Titanex as a German company is more known and used here.
I did use LP5 and LP11 antennas on DX-ped. and know lots of Hams using LP.. at home. The LP5 (5 ele 20-10m) is small (boom size), light (material titanum) and plays like a 3 ele yagi. 20m is not that good because the longest element works as driven element (no reflector). Ask users for their opinions (LP5 ask email@example.com
I don't know anybody using this 2 ele Quad. But I don't like it because you need a antenna tuner and a special feedline for it.
regards Holger, DL7IO