Jamis are a long standing American brand and are only distributed by Evans over here - they have nothing to do with the design or build....
My mate has a carbon Jamis road bike and loves it - the budget Durango & Trail X range of MTBs is really nice, & I wouldn't have a problem with getting one...
My youngest is riding a 2015 Hard Rock and loves it. Spends most of his time riding it along the under-cliff to Brighton (& beyond) with his mates - & occasionally over the back of Peacehaven & Woodingdean along the SDW trails. I couldn't fault Specialized (my 1994 Rockhopper is still going...