I had the 595 for a season. A lot of nice features, I especially liked the TPM. However, the curvy road feature was horrendous and trip planning was very tedious and frustrating.
I now use Kurviger on my phone. The route planning is fantastic. The curvy road feature is outstanding. This is a very low cost app with a free trial version. I highly recommend this app especially for day trip planning in the North East.
I'll add alternate TPM. Bright sun display is marginally better on 595 than on my phone and I think the 595 is waterproof which may be a significant factor for some.