I don't know much about the Bohmen brand... but the kits look ok.
http://www.proxenon.com/view_product...?category_id=1
Companies will claim that you don't need high beams for two reasons:
1. They're using the wrong bulb: D2S... which is most common when they should be using D2R which has a stationary shield to help reduce glare. D2R bulbs are less common, therefor more expensive to source. Note, I said help reduce glare. Ultimately it's better to use E-code (European code) projector lens type lamps with HIDs. The cutoff is much sharper and much less glare beyond the cutoffs.
2. They lack the technical know-how to design and produce the mechanisms necessary to produce a bi-xenon bulb... whether it is a solenoid based system or a mechanical shutter system. Or, they have no interest in investing $ in R & D... which is probably the case with HIDs4less given their record with money handling. Bellof uses a solenoid base, so does Catz.