Worst in entire industry hands down.
Its down at least once daily
If you attempt to submit a wager, good luck, and if it is accepted you just got shafted a solid point, point and a half. (Had one last night where I bet under and 2 quick buckets later YW accepted at original line, of course they did).
If they do offer a game in-play doesn't mean you can bet it because they usually have locks on majority of options. Unless you like to bet odd or even, YW never locks that option.
Lines/prices a good point/10 cents off market average.
Page actually refreshes and doesn't just update like a legit live, for instance 365. This usually wastes 30 seconds with load and finding your play again, crucial live.
Do not plan on hedging because no guarantee the option will be there later. YW just pulls options whenever they want, just a heads up.
I play there because options suck in USD but their CS setup sucks as well, kind of like waiting for dial up back in the day.
I have screenshots of all above on my phone because it happens daily and I knew I would eventually reach my limit with this shit book.
Good thing is if you're lonely don't worry YW will call and email you daily to keep you company.
B+ rating here is overrated, know many so called C and even a few D rated that are much better options.
Just my take.