I use the Ultimate MX. It is expensive, somewhat heavy (but, aren't they all). and it takes a bit of experience to use it correctly. However, it DOES work okay with a stock TW. A Ricochet shield and bigger pegs help but are not necessary. I have carried my TW both ways. Plus, it looks cool. It takes about 5 minutes to put the bike on and less than 2 to take it off.
Having said all that, I do not think I would buy another one. I did get mine for $300.00 on Craigslist. New they are $430.00.
I am looking for some pictures. Here is a link to a YouTube: