Tube Overdrive (w/ Real Tube)

Hi Guys, :)
I'm new here and was wondering about other input on the 12ax7 Tube pedals.
I am thinking about getting one to mess around with.
I have a few different Fender Amps (Blues Jr, Hot Rod Deluxe and a Hot Rod Deville 410) if you need to know.
I play blues (usually on a Strat with Texas Specials) and like having a bite through anything sound on leads.
If you have one of the tube pedals or have had one, please shout out the pros' and cons'.
I have many other Overdrive pedals, but just wanting to know more about the real tube type pedals.
Thank you, I look forward to the info.

Thank you,
Eric

I kinda hoped that somebody would reply.
I have gotten immediate response on another forum and decided to get the Butler: Toneworks RealTube pedal.
Since nobody here has an opinion, I will post mine when I have had some time to play it.
Talk to you then.