While it is clear that the Me 262 saw combat, and that the Me 163 did, it was in service and operational in 1944, and that the Ar 234 certanialy saw service. the adation of these planes was never a questionable one, and they are certainaly a blast to fly, and worth the mony I think*. The Allied Jets are a debatable mater, the Metieour did see far more use than any of the others operated on the allied side, howeaver her performance was not eactly steller, so how can we say that the real advesary of the 262 was the Brit jet when in fact it was those allied planes that actualy engaged it, the one's with prop's....
The He 162 was in service, did see combat( in the east and west), and did get kills. IMO it is now the last of the truly viable wounder weapons, the maned one's at least, (other than the baka, or a katien, maybe)
* The Ar 234 is a wounderfull plane and one of my all time favoate planes in AH. Howeaver with the new bomb sight using it effectavel as modeled is a bit of a problem, I hope HTC see's fit to add a Dive bomb sight for her.