j123j:
I went through a similar scenario when deciding to purchase my TS as I was looking for the capability to rip hardwoods. It was recommended by some to purchase the TS5 because when the extra depth was needed I could just cut to max depth, flip the piece over, and cut the rest of the way through.
In the end, I decided to purchase the TS75 primarily for its extra power for use with hardwoods. I've used it to rip both 1" yellow birch and 1" hard maple and it goes through each like butter. I recently had the opportunity to use the TS55 at the onsite cabinetry end-user training class in Lebanon, Indiana, last week. The 55 was a nice saw, lightweight, and was good for cutting sheetgoods. However, I noticed a few things that made me appreciate my TS75.
We used the TS55 to cut some plywood and I had to slow down a little bit compared to my TS75. Not that its a race, but with the TS75 I just cut and don't really have to consider the speed at which I move the saw across the guiderail. I also began to actually appreciate the extra weight of my TS75... it seems as though the extra weight lends itself to the saw feeling more stable on the guiderail.
Now, I will say that I started out using a TS75 and had never used a TS55 until last week. So, my experience may be that I just became used to using the TS75 and developed the muscle memory that made it very comfortable and made the TS55 seem just a little bit out of place in my hand.
Good Luck,
Corey
U.P. of Michigan