I have had a 15ft steel SE for about 3 years I guess now, and really pleased with it, its a great little trailer for the roadster and also now will be using it for the miata as well.
I don't think there are any issues unique to it, I do wish it was a foot longer, I did add a cheap winch from Harbor Freight as I am much more comfortable pulling the car up the driving it up, especially if loading it alone. The ramps on mine, while I haven't had an issue with them coming off, I have had them walk out from the stored position while towing. On my model the back of the cover is all that was holding them in place so I added a short chain and a clip. I also added or should say have tried to add some additional turn indicators on the back of the trailer, as on mine the only sides markers are on the fenders of the trailer which make them hard to see for someone directly behind you.
All that said, it really does tow well. I originally pulled it with a Ram 1500 and it was effortless. I pull now with an 08 Mercury Mountaineer V8 which also has no problem pulling it. The shorter wheelbase mountaineer I do get a little trailer sway from time to time, but nothing major.
Over-all been very pleased with the SE.
Scott