That is 100% up to you

Just because eBay promote them doesn't mean go ahead and use them if you don't know a thing about the company

A quick look at the forum would have shown how 'good' they are

If you do decide to keep the things you have listed listed please be careful

High priced items like those from someone who looks to be inexperienced to any scammer having 'a quick look' is going to be very attractive to such people

Also, if you do stay, hopefully you have fully completed sign up to Managed Payments and have been verified to sell, and read up on all the changes since you last sold

And especially don't risk Sendle again, no matter what 'eBay suggests'