FDT -
In my opinion, it really comes down to what you want and how much you want to spend on a finish. Thunderbird is an excellent finish - the bows I have with this finish are nice looking and have held up very well to hunting condition.
With that said, I have a hard time justifying a compressor, a sprayer, and $50.00 per pint for thunderbird to finish the 1 or 2 glass bows I might make per year. (not to mention cleanup).
For the few I make, I have found that a quality lacquer finish (watco) in the aerosol can gives pretty darn good results. I spray several coats of gloss following the manufacturer instructions. Then I let it cure for a few days and then finish with 3-4 coats of satin.
It is probably not as durable as an epoxy finish such as thunderbird - but you can get a good finish for about $10.00 with no clean up.
If I ever get to the point where I am making 10 bows a year then I most likely will look into a sprayer and start using thunderbird.
Good luck with whatever you decide.