I have used the the Voyager 510 for two years. i have used it in every conceivable configuration. It has worked admirably with my two windows mobile devices (xv6700 and 6800). It even worked fairly well doing skype calls on the 6700 but not the 6800. I connect it everyday to my office VOIP phones(grandstream) at work and at home using the BF8 base units. The range is quite good with the base units (about 30ft.)I frequently use my 510's connected to both the base units and my cell phone at the same time. I have used it with my laptop for Skype and MSn calling with great success. The unit is quite rugged and easily stored in the pocket once you learn to turn the boom to vertical. There is no other ear-set this versatile and rugged. It is a thoroughly professional device for people serious about making and receiving clear phone calls. The ear-set is much more secure in the ear than others and allows me to wear it whilst crawling around, upside down and so forth. I use the ear-gels that are provided.