I have the Rockwell Sonicrafter as well.
I just bought it fairly recently and haven't used it much though I expect to use it a lot on the old (1955) house I just bought.
I read quite a lot on them and watched a couple of videos before I went to the store.
The Rockwell has a couple of features that I liked before I actually laid hands on it.
One is the blade change system, its fairly simple yet works well. Some of the reviews misunderstood how it works though. You don't have to remove the center piece for most blades, just loosen it - for some reason the reviewers had what I consider an unrational fear of losing the holding piece, I gather they must have been taking it all the way out every time.
Still only a blade change function so not make or break as long as it works well.
The F80 version of the Sonicrafter also has a unique feature, you have a choice of blade oscillation angles, all the other brands only have a fixed angle - currently anyway. The angle determines how fast it cuts, larger for fast cuts (5 degrees I think) and less angle for slower cuts with more control. (3.5 degrees?)
Speed of the tool also plays a part and pretty much all of them are variable speed with a wheel, except the dewalt. It has a variable speed trigger. At first I thought this would be a nice option, but I gather its difficult to control at odd angles/tool placements. Given that a multisaw spends most of its cutting time in odd situations this seems more like drawback than a plus.
I've only used my saw a couple times and I will have to agree that a trigger controlled speed would be a hassle.
I had to repair my shower valve for example. Its behind a tile wall and has screwdriver stops that were leaking. Whoever tiled the wall didn't leave enough room to remove the valves so I had to cut 2 v-shaped pieces of tile out.
To do that I had to hold the saw in 4 odd positions, one right after the other. No problem with the Sonicrafter, but would have been a hassle if I would have had to use a trigger.
Rockwell also makes pretty decent blades according to all the reviewers that mentioned blades, and their blades were often recommended for other brands of tools even.
I had already planned to cut the poorly installed grout out around my shower and tub - which was actually what I initially purchased the saw for, before the valve became a larger than expected job.
So I bought a better blade for that, carbide I think, and they don't recommend it for cutting tile, but it lopped those 2 small pieces out no problem. Took longer to get the saw plugged in and in position that it did to cut them.
I wasn't quite ready to buy the saw, but I was in either lowes or home depot and was in the tool section so thought I'd check them out.
The Rockwell felt good in my hands which is nice. The blade mechanism appeared solid and well made, as did the head and switch for the two blade pitch options - about which I had some concerns before getting an actual look at.
There were several Rockwell blades in their selection, more than all the others combined - even though I believe the Rockwell will take almost any blade should the need arise. Rockwell's blades are a little more expensive, but I don't mind that for a better blade. Generally I find projects have enough intrinsic stress I don't need to fight my tools as well.
It was also on sale for $20 less I believe, so even though I wasn't quite ready for it, I bought it anyway. Glad I did or the shower issue would have been an even bigger hassle.
$150 or the $130 I paid is more than many of the other multitools, but I figure it will last me for the rest of my life so I'd rather have a good one.
Edit: I have since been to the other box store and they had a large selection of Rockwell blades also.
I bet if he had one he'd use it.