I've got a Tourmaster CoreTech, a AeroStich Roadcrafter one-piece, a Joe Rocket Ballastic 3.0, and a MotoPort Ultra II. My favorite jacket is definitely the MotoPort by far.
I suffered many a long winter ride in the AeroStitch, the RoadCrafter is a very cold suit, and the one-piece is ***** to layer under (a good fitting suit means you'll need electrics to say warm, which I didn't have). The AeroStitch also isn't all that waterproof, I've spent many 8-10 hour days in rain and the Stitch was only good for about 3-4 hours before the cordura was soaked and the DWR was defeated. And yes, I renew the DWR coating yearly. The one-piece has the other problem of leaking through the zipper at the crotch, but it's a known issue , and I knew that when I purchased it. Overall the Stitch is great around town, hot as hell in the summer, and ok for longer rides... I really like the versatility of the two piece suit better, but didn't know that when I bought my onepiece.
The TourMaster and the Joe Rocket are good entry level jackets. They are both entirely useable and have some very nice features. I like the collar on the JR jacket, it's cut high in the back and has a nice fake suede lining. I haven't had it in a heavy rain, but it did leak through the preponderance of zippers and vents on the front of the jacket in a light rain. This might not be a problem on a fully faired bike. The arms are also precurved on the JR, but the armor in my XL doesn't fit right, it's almost as if the pads are the same size for every jacket size, so in some places they are too small for me. The Coretech is very old model (98 or 99) so might have changed. It has far less features than the JR, but the overall construction seems to be more robust. It is a simple design and that's where it's stregths lie. It fits well, has just enough pockets and is good for a rain storm.... Anything more than a couple hours or so, and I think it'd start to leak.
The MotoPort Ultra II has to be the most robust jacket I have seen. The entire thing is 1000 denier Cordura and has a separate zip out h20 liner. This is what confuses people the most about this jacket... It's really just an uncoated shell with armor and an extremely warm and waterproof zip in liner. It adds a lot of flexibility to the jacket, but you still have to worry about zipping in the liner if it starts to really rain. I wore it all summer here in DC and though it doesn't breath as well as the new mesh jackets, it does breath a helluva lot more than my Stitch. I like the flexiblity of the shell/liner combo as well as the fact I got a deal on mine by buying used. Strengths are its construction and versatility. The liner is extremely waterproof as well as very warm, I spent 10+ hours in late November riding around W.Va and Viriginia in the rain, it didn't leak nor did I get "muggy" like I do in my Stitch when the DWR fails. I only had to turn my electrics on half way through the ride. You have to get used to the fact that because the shell isn't coated, it gets soaked, but because the goretex liner is not laminated to the shell, it's no problem, you still maintain air space for the liner to breathe, and hence prevents the muggy feeling. I have applied a DWR (NikWak wash in stuff) to the Motoport in hopes that this summer it'll be enough to keep me dry in sudden summer showers. And yet another strength is no break-in time whatsoever, unlike some of the horror stories I've heard about Darien break-ins from fellow riders. The downsides to this jacket: dowdy is the best way to describe the styling, they don't offer tall sizes (then again, I never asked them, so it might be possible), they never answer email (call them), you have to carry the liner with you, and elbow pads are placed strangely.
Needless to say these observations are only valid for the types of riding I do, namely, a lot of long (300-700 miles) days on my Concours (faired), and a lot of dual sporting on my KLR (nearest dirt is 2 hours from me and I don't own a truck, so I ride there). I ride all year round, even put 34 miles on my KLR yesterday riding around DC in the snow storm. And for reference I am 6'4", about 240lbs. and wear a 46L suit jacket.
Z