Robert, I also ate a little crow. . .
 I thought twice about adding the streets to the unit. . .Especially since I had  a 2 GPS's that had streets in the first place.
I have been using Explorer units for backup flying, along with my GPS units in my Cherokee 180.  I took a 600 mile one way trip to Houston Tx. . .Sugarland International to bring my Mother to the MD Anderson Cancer Center.  Those explorers had all the airports, cities and even streets.  They did good enough.
So I purchased this I 700.  Totally by word of mouth.  I added the streets (with hesitation).
Not only did the I 700 do wonderfully well with tracking my progress the second time there, but the streets did a far better job than my older Explorer unit.  It was well worth the extra money.   Even my mom could use the unit. . .(Now that is scary. . .)
 There is a very good marriage between the systems. . . A totally versital unit that works well in the air, as well as the ground.  What more could you ask for?