I agree with you. Particularly if you do not have P2 in your area, or any systems plans to change to P2, the purchase may be a reach. There have been some mixed reports on reception. I am hoping most reports are really comparative and not just "I think it tracks or sounds better" to justify the purchase.
I'm using the Radio Shack 800MHz antenna on my 436hp, and it's sensitivity is better than either of my 396XT's (one using the R/S 800, the other a Diamond RH77CA, but previously an 800). Most all of the Vhf-high of interest is relatively close, so no reception problems. The main Uhf channels of interest to me are Dallas PD & Dallas Fire/Rescue. But I'm maybe 4 to 5 miles from the main transmit site, and the signal is so strong, I literally don't need an antenna on any of the scanners.
The 436 is usually decoding the
PAWM P25 system, with no or at most one bar, while the 396XT rarely stops on it. I'm probably 20-25 miles form the closest site, and that system gives problems to people living within it's jurisdiction, based on their posts in the Texas Forum.
So, in my case, especially since several large suburban systems will be changing to Phase II in the next year or so, it's been worth it.