I have never used SVM but i have used backpropagation method (modified with momentum term added, adaptive learning rate, with trainbr, trainrp and trainscg functions) for various purposes. I found that its very much suitable for training complex real-valued and noisy kind of data.
Q: I noticed that you present results on noisy patterns starting from 0% noise. Is that a problem for your method?
A: On the contrary, BPM results are better than those in the backpropagation method. BPM method is even able to effectively eliminate the noise.
Q: If you have noisy patterns throughout (always 10% noise) will that degrade the performance, or, if the noise diminishes, which I could imagine would be a problem for any constructive algorithm?
A: Yes, noise degrade the results, but less than by the backpropagation method. Noise can be also reduced without any special problems for algorithm.