Well, I bought a Harmonix PS3 guitar and it was damaged. I returned it and then looked online, and noticed the Nyko Frontman was "shipping" from Amazon. Ordered one, and it is actually en route! FedEx lists the package as being 43lbs though. WHAT?! I hope there's a decimal place error there. Will report back soon. TAC guitar has dual struts, but I don't think those are necessary for bass guitar really, and the Nyko seems to have received favorable reviews. The idiots at IGN reviewed it but completely missed out on the key feature of being able to play both games. They reviewed it and concluded that it is a good 3rd party guitar but not worth the $10 cost reduction compared to the guitar hero guitar. Uh, hello?! You can't use that in Rock Band, morons...
One nice feature is that you get a USB cord and can charge the guitar while using it similar to the controller.
Anyway, will play with it this weekend and report back.