SV VC-funded startup that began in TX as an LLC and transitioned to DE C Corp. Working fine for us (so far). We started as a TX LLC pre-funding, which worked fine and was easy for our purposes. Only 3 employees (2x 50/50 co-founders paying engineer out of pocket 50/50).
When we started getting term sheets, the big law firms for general counsel were willing to take us on under the expectation we pay them back until we closed our Seed Round. They helped to structure the DE C-Corp, transfer everything to the LLC, and directed me on all the paperwork that needed to be filed.
Winding down the LLC was easy, but you just need a controller/accountant to help you close the books properly and file the paperwork.
If you intend to go this route, my only major recommendation is to pick a name that is different/slightly different than what you ultimately want the company to be called. We ran into naming conflicts, which was an unnecessary PITA.
Second side-piece of advice: ask the general counsel to give you a fixed-cap cost for closing the round. We got stuck in some licensing negotiations as part of the close, which made things way more expensive than they should have been.