First off, I can't help with an owner review but I notice there are a few decent reviews on the Tecsun Australia web site. It seems a pretty good basic radio but whether it's adequate might depend on how you want to use it, and what external decoders etc you plan to use (you mentioned NavTex). On my reading of the manual it does support LW and MW operation, with both USB and LSB modes always available.
I find that ergonomic limitations in a radio of this format can be quite severe: for example, I have an Icom R20 and rarely use it just because it's such a pain to operate, especially for SSB. Crazy menus don't help, either. However, it's much more usable when listening to one frequency, in one mode, for extended periods.
The external MW antenna for the Tecsun appears to be just 6 m of wire, so I'd just grab a 3.5 mm plug and make your own antenna. The radio will almost certainly benefit from a better, outdoor antenna. Simpler receivers are often a bit limited in dynamic range: you want a strong signal, but don't want strong local interferers. A good outdoor antenna will almost always help but check for overload if you live near strong broadcast stations.
If you don't have to have an ultra-portable receiver you could keep a watch out for a used communications receiver, or a ham transceiver with general coverage receiver going down to LF/MF.
73, Peter.