Well, I'm a daily commuter, so I have a lot of miles (10,000+ on the Vanguard before I sold it and then 20,000+ on the Slipstream so far), but I can't tell you what touring at 75-100 miles a day for weeks or a month is like. I like the Slipstream fine at 25+ miles a day round trip, although I probably miss some aspects of the Vanguard, but there were a couple things I wanted on the Slipstream so I made the change. Comparatively, probably a Vanguard with a front disc fork and a RANS seat upgrade would come really close to being an even match for the Slipstream, missing only the higher bottom bracket and more-forward weight distribution of the Slipstream. How do I like the Slipstream? I like it a lot, it's exactly what I wanted for a year-round commuter, more or less indestructible while also quite comfortable = very reliable and very easy to fine tune to my particular comforts in terms of seat and steering adjustments.
Originally Posted by Balsawings
If you find you are ready to make a change, my advice is buy a used one as you'll save a boatload of $$$ and still have the same bike (with patient and diligent searching probably $800+ for a nice Vanguard, $1300 or less for a Slipstream that's 3-4 years old). Have a look at some of the below for-sale sites when you're in the mood to change (there are many more smaller for-sites, but I've found almost everyone with a bent for sale will post in at least one of the four sites below):