[TenTec] Have questions

[John]

Hello , I am currently saving for a nice Orion 1 .  I am tiring to get a handle on what to look for on the used market.  I have heard that a radio with all the  optional roofing filters installed actually desensitizes the radio and may not be any kind of an advantage , and that the slick operator puts in a Inrad filter at the 1.8 position and this allows closer in sensitivity ?  can you advise?  Am I close ?   soooooooo confused !   thanks  John kb2huk