Go for it!!! I just bought one two weeks ago! I bought a 1915 Singer model 15-30 treadle. I read ALOT of the posts here and elsewhere and tried to follow the advice with what I bought. I have taken it ALL apart and I am in the process of cleaning and polishing ALL of it. I would have never thought that I could do this but I AM!!! and I AM having a lot of fun doing it.
I am reading the entire post at the Vintage Sewing Machine Shop. I only started it a couple of weeks ago and I am reading every page!! (I am up to page 558!) There is a wealth of information there as well as some really great pictures. I found my Singer on Craigslist for $35 and so far its the best money I have spent in a long time.
I am looking forward to getting this "puppy" back together so that I can treadle! I have never before sewn on a treadle but they have always facinated me. I have even learned on the posts how to get started treadling. So study up and make an informed decision!