Like all the NET vendors discussed on this thread, HHV has its fans and detractors. Some NET diehards love HHV; others not so much. HHV's claim to fame is its NET hybrid blends, where the tobacco is somewhat restrained to balance with a mix of other non-tobacco flavorings. Legend is the best example of that style in HHV's line. Huntsman is a more straightforward natural tobacco, while Oompa is natural tobacco with chocolate. If I were buying for a friend who smokes aromatic pipe blends, I'd pass on Oompa. Chocolate is a difficult flavor to get right in vaping liquids; mixing it with tobacco doesn't make it any easier. Caramel Apple Tobacco and Sweet Swish are both synthetics, which is fine, but know going in that they're not natural tobaccos. Sweet Swish is HHV's take on Swisher Sweet Cigars, for what that's worth.
If I were in your shoes, I'd consider N-E-T.com rather than HHV for gifts to a pipe-smoking friend. Not that HHV isn't OK, but Clay's (the owner of N-E-T) pipe blend extractions might have better odds being right up your friend's alley:
Pipe Blends from N-E-T.com
You could get your friend one or two pipe sampler packs:
3-pack Pipe Sampler from N-E-T.com