It can be done and you're right. Your basically getting the burner and benefit would be to have access to tunes rather than sending your chip in for any changes.
I think Cody is saying that you are already good with the tunes you have and it would be a waste to the other tunes 
I went with the FU as recommended from Bill because I will be upgrading in stages. He said in the long run, I would probably save compared to sending the chip all the time for the upgrades. I think it can go either way.
In the end, its up to you. I do not know you exact situation, so I am not sure what else to say. Good luck with your decision. Its greatthat Cody is giving you honest info and helping you save money; you do not get that from everyone 
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03 F350 7.3L Auto CC LB Dually 410's (LS Rear)
DP F5 w/guage style switch. NS,Stock,1200RPM high idle,60t,80e,120r
Nexus Guages (TT,FP,BP,EGT), 4"MBRP Exhaust. Coolant filtration system,203*stat and billet housing, AIH delete, HP X-Over line. (Baldwin PA2818) Bellowed up-pipes; TN Turbo(non-BB), BTS VB, In-Tank mods. RR FRx & Boots. 6.0Tranny Cooler
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