I have a 26er inbred, and a 29er inbred frame to be built. Girlfriend has 456, my two best mates have 29er Inbreds and a Parkwood between them.
Inbreds and 456 are tough and fun bikes to ride, very capable. Quite heavy.
Parkwood is lovely to ride and quite light.
All are very good value for what you get.
They don’t have the feel of 853 or titanium, you wouldn’t expect that. But I don’t wince with rock strikes, and I wouldn’t be gutted i’d lost £500 if i broke it in a chrash (would take some doing, as that weight equates to toughness!).