Im quite hesitant about buying a lifted (and to that degree) Jeep. For me its, "Well did he do good work on installing it? What could have gone wrong?" I am with Hudson, I find greater value in doing the work myself, then I know what went into that lift, and if there is an issue with the Jeep, you know what it could possibly be.
Also, look into the head. If it hasnt been replaced, I would probably avoid it. I bought mine and the head cracked and the gasket blew a month later. '00 and '01 XJ's have a notoriously bad head. 97-99 I would say were the prime years for the XJ.
SOLD- '13 JKR with lots of goodies
Current- '98 TJ Sahara: build coming in October